lucasbru commented on code in PR #17564: URL: https://github.com/apache/kafka/pull/17564#discussion_r1815049433
########## clients/src/main/java/org/apache/kafka/clients/consumer/internals/StreamsMembershipManager.java: ########## @@ -0,0 +1,823 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.kafka.clients.consumer.internals; + +import org.apache.kafka.clients.consumer.internals.events.BackgroundEventHandler; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackCompletedEvent; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackNeededEvent; +import org.apache.kafka.clients.consumer.internals.metrics.ConsumerRebalanceMetricsManager; +import org.apache.kafka.clients.consumer.internals.metrics.RebalanceMetricsManager; +import org.apache.kafka.common.KafkaException; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.Uuid; +import org.apache.kafka.common.message.StreamsGroupHeartbeatResponseData; +import org.apache.kafka.common.metrics.Metrics; +import org.apache.kafka.common.protocol.Errors; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatRequest; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatResponse; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryProvider; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryReporter; +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.common.utils.Time; +import org.slf4j.Logger; + +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Optional; +import java.util.SortedSet; +import java.util.TreeSet; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +public class StreamsMembershipManager implements RequestManager { + + private static class LocalAssignment { + public static final long NONE_EPOCH = -1; + public static final LocalAssignment NONE = new LocalAssignment( + NONE_EPOCH, + Collections.emptyMap(), + Collections.emptyMap(), + Collections.emptyMap() + ); + + public final long localEpoch; + public final Map<String, SortedSet<Integer>> activeTasks; + public final Map<String, SortedSet<Integer>> standbyTasks; + public final Map<String, SortedSet<Integer>> warmupTasks; + + public LocalAssignment(final long localEpoch, + final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + this.localEpoch = localEpoch; + this.activeTasks = activeTasks; + this.standbyTasks = standbyTasks; + this.warmupTasks = warmupTasks; + if (localEpoch == NONE_EPOCH && + (!activeTasks.isEmpty() || !standbyTasks.isEmpty() || !warmupTasks.isEmpty())) { + throw new IllegalArgumentException("Local epoch must be set if tasks are assigned."); + } + } + + Optional<LocalAssignment> updateWith(final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + if (localEpoch != NONE_EPOCH) { + if (activeTasks.equals(this.activeTasks) && + standbyTasks.equals(this.standbyTasks) && + warmupTasks.equals(this.warmupTasks)) { + + return Optional.empty(); + } + } + + long nextLocalEpoch = localEpoch + 1; + return Optional.of(new LocalAssignment(nextLocalEpoch, activeTasks, standbyTasks, warmupTasks)); + } + + @Override + public String toString() { + return "LocalAssignment{" + + "localEpoch=" + localEpoch + + ", activeTasks=" + activeTasks + + ", standbyTasks=" + standbyTasks + + ", warmupTasks=" + warmupTasks + + '}'; + } + + @Override + public boolean equals(Object o) { + if (this == o) return true; + if (o == null || getClass() != o.getClass()) return false; + LocalAssignment that = (LocalAssignment) o; + return localEpoch == that.localEpoch && + Objects.equals(activeTasks, that.activeTasks) && + Objects.equals(standbyTasks, that.standbyTasks) && + Objects.equals(warmupTasks, that.warmupTasks); + } + + @Override + public int hashCode() { + return Objects.hash(localEpoch, activeTasks, standbyTasks, warmupTasks); + } + } + + static final Utils.TopicPartitionComparator TOPIC_PARTITION_COMPARATOR = new Utils.TopicPartitionComparator(); + + private final Logger log; + + private final StreamsAssignmentInterface streamsAssignmentInterface; + + private final SubscriptionState subscriptionState; + + private final ConsumerMetadata consumerMetadata; + + private final BackgroundEventHandler backgroundEventHandler; + + private final Map<String, Uuid> assignedTopicIdCache = new HashMap<>(); Review Comment: Never used? ########## clients/src/main/java/org/apache/kafka/clients/consumer/internals/StreamsMembershipManager.java: ########## @@ -0,0 +1,823 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.kafka.clients.consumer.internals; + +import org.apache.kafka.clients.consumer.internals.events.BackgroundEventHandler; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackCompletedEvent; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackNeededEvent; +import org.apache.kafka.clients.consumer.internals.metrics.ConsumerRebalanceMetricsManager; +import org.apache.kafka.clients.consumer.internals.metrics.RebalanceMetricsManager; +import org.apache.kafka.common.KafkaException; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.Uuid; +import org.apache.kafka.common.message.StreamsGroupHeartbeatResponseData; +import org.apache.kafka.common.metrics.Metrics; +import org.apache.kafka.common.protocol.Errors; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatRequest; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatResponse; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryProvider; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryReporter; +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.common.utils.Time; +import org.slf4j.Logger; + +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Optional; +import java.util.SortedSet; +import java.util.TreeSet; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +public class StreamsMembershipManager implements RequestManager { + + private static class LocalAssignment { + public static final long NONE_EPOCH = -1; + public static final LocalAssignment NONE = new LocalAssignment( + NONE_EPOCH, + Collections.emptyMap(), + Collections.emptyMap(), + Collections.emptyMap() + ); + + public final long localEpoch; + public final Map<String, SortedSet<Integer>> activeTasks; + public final Map<String, SortedSet<Integer>> standbyTasks; + public final Map<String, SortedSet<Integer>> warmupTasks; + + public LocalAssignment(final long localEpoch, + final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + this.localEpoch = localEpoch; + this.activeTasks = activeTasks; + this.standbyTasks = standbyTasks; + this.warmupTasks = warmupTasks; + if (localEpoch == NONE_EPOCH && + (!activeTasks.isEmpty() || !standbyTasks.isEmpty() || !warmupTasks.isEmpty())) { + throw new IllegalArgumentException("Local epoch must be set if tasks are assigned."); + } + } + + Optional<LocalAssignment> updateWith(final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + if (localEpoch != NONE_EPOCH) { + if (activeTasks.equals(this.activeTasks) && + standbyTasks.equals(this.standbyTasks) && + warmupTasks.equals(this.warmupTasks)) { + + return Optional.empty(); + } + } + + long nextLocalEpoch = localEpoch + 1; + return Optional.of(new LocalAssignment(nextLocalEpoch, activeTasks, standbyTasks, warmupTasks)); + } + + @Override + public String toString() { + return "LocalAssignment{" + + "localEpoch=" + localEpoch + + ", activeTasks=" + activeTasks + + ", standbyTasks=" + standbyTasks + + ", warmupTasks=" + warmupTasks + + '}'; + } + + @Override + public boolean equals(Object o) { + if (this == o) return true; + if (o == null || getClass() != o.getClass()) return false; + LocalAssignment that = (LocalAssignment) o; + return localEpoch == that.localEpoch && + Objects.equals(activeTasks, that.activeTasks) && + Objects.equals(standbyTasks, that.standbyTasks) && + Objects.equals(warmupTasks, that.warmupTasks); + } + + @Override + public int hashCode() { + return Objects.hash(localEpoch, activeTasks, standbyTasks, warmupTasks); + } + } + + static final Utils.TopicPartitionComparator TOPIC_PARTITION_COMPARATOR = new Utils.TopicPartitionComparator(); + + private final Logger log; + + private final StreamsAssignmentInterface streamsAssignmentInterface; + + private final SubscriptionState subscriptionState; + + private final ConsumerMetadata consumerMetadata; Review Comment: Do we need this? never used? ########## clients/src/main/java/org/apache/kafka/clients/consumer/internals/StreamsMembershipManager.java: ########## @@ -0,0 +1,823 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.kafka.clients.consumer.internals; + +import org.apache.kafka.clients.consumer.internals.events.BackgroundEventHandler; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackCompletedEvent; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackNeededEvent; +import org.apache.kafka.clients.consumer.internals.metrics.ConsumerRebalanceMetricsManager; +import org.apache.kafka.clients.consumer.internals.metrics.RebalanceMetricsManager; +import org.apache.kafka.common.KafkaException; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.Uuid; +import org.apache.kafka.common.message.StreamsGroupHeartbeatResponseData; +import org.apache.kafka.common.metrics.Metrics; +import org.apache.kafka.common.protocol.Errors; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatRequest; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatResponse; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryProvider; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryReporter; +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.common.utils.Time; +import org.slf4j.Logger; + +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Optional; +import java.util.SortedSet; +import java.util.TreeSet; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +public class StreamsMembershipManager implements RequestManager { + + private static class LocalAssignment { + public static final long NONE_EPOCH = -1; + public static final LocalAssignment NONE = new LocalAssignment( + NONE_EPOCH, + Collections.emptyMap(), + Collections.emptyMap(), + Collections.emptyMap() + ); + + public final long localEpoch; + public final Map<String, SortedSet<Integer>> activeTasks; + public final Map<String, SortedSet<Integer>> standbyTasks; + public final Map<String, SortedSet<Integer>> warmupTasks; + + public LocalAssignment(final long localEpoch, + final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + this.localEpoch = localEpoch; + this.activeTasks = activeTasks; + this.standbyTasks = standbyTasks; + this.warmupTasks = warmupTasks; + if (localEpoch == NONE_EPOCH && + (!activeTasks.isEmpty() || !standbyTasks.isEmpty() || !warmupTasks.isEmpty())) { + throw new IllegalArgumentException("Local epoch must be set if tasks are assigned."); + } + } + + Optional<LocalAssignment> updateWith(final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + if (localEpoch != NONE_EPOCH) { + if (activeTasks.equals(this.activeTasks) && + standbyTasks.equals(this.standbyTasks) && + warmupTasks.equals(this.warmupTasks)) { + + return Optional.empty(); + } + } + + long nextLocalEpoch = localEpoch + 1; + return Optional.of(new LocalAssignment(nextLocalEpoch, activeTasks, standbyTasks, warmupTasks)); + } + + @Override + public String toString() { + return "LocalAssignment{" + + "localEpoch=" + localEpoch + + ", activeTasks=" + activeTasks + + ", standbyTasks=" + standbyTasks + + ", warmupTasks=" + warmupTasks + + '}'; + } + + @Override + public boolean equals(Object o) { + if (this == o) return true; + if (o == null || getClass() != o.getClass()) return false; + LocalAssignment that = (LocalAssignment) o; + return localEpoch == that.localEpoch && + Objects.equals(activeTasks, that.activeTasks) && + Objects.equals(standbyTasks, that.standbyTasks) && + Objects.equals(warmupTasks, that.warmupTasks); + } + + @Override + public int hashCode() { + return Objects.hash(localEpoch, activeTasks, standbyTasks, warmupTasks); + } + } + + static final Utils.TopicPartitionComparator TOPIC_PARTITION_COMPARATOR = new Utils.TopicPartitionComparator(); + + private final Logger log; + + private final StreamsAssignmentInterface streamsAssignmentInterface; + + private final SubscriptionState subscriptionState; + + private final ConsumerMetadata consumerMetadata; + + private final BackgroundEventHandler backgroundEventHandler; + + private final Map<String, Uuid> assignedTopicIdCache = new HashMap<>(); + + private MemberState state; + + private final String groupId; + + private String memberId = ""; + + private final Optional<String> groupInstanceId = Optional.empty(); + + private int memberEpoch = 0; + + private Optional<CompletableFuture<Void>> leaveGroupInProgress = Optional.empty(); + + private CompletableFuture<Void> staleMemberAssignmentRelease; + + private boolean reconciliationInProgress; + + private boolean rejoinedWhileReconciliationInProgress; + + private final Optional<ClientTelemetryReporter> clientTelemetryReporter; + + private LocalAssignment targetAssignment = LocalAssignment.NONE; Review Comment: This is called "currentTargetAssignment" in `AbstractMembershipManager`. Why the different names? ########## clients/src/main/java/org/apache/kafka/clients/consumer/internals/StreamsMembershipManager.java: ########## @@ -0,0 +1,823 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.kafka.clients.consumer.internals; + +import org.apache.kafka.clients.consumer.internals.events.BackgroundEventHandler; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackCompletedEvent; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackNeededEvent; +import org.apache.kafka.clients.consumer.internals.metrics.ConsumerRebalanceMetricsManager; +import org.apache.kafka.clients.consumer.internals.metrics.RebalanceMetricsManager; +import org.apache.kafka.common.KafkaException; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.Uuid; +import org.apache.kafka.common.message.StreamsGroupHeartbeatResponseData; +import org.apache.kafka.common.metrics.Metrics; +import org.apache.kafka.common.protocol.Errors; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatRequest; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatResponse; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryProvider; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryReporter; +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.common.utils.Time; +import org.slf4j.Logger; + +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Optional; +import java.util.SortedSet; +import java.util.TreeSet; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +public class StreamsMembershipManager implements RequestManager { + + private static class LocalAssignment { + public static final long NONE_EPOCH = -1; + public static final LocalAssignment NONE = new LocalAssignment( + NONE_EPOCH, + Collections.emptyMap(), + Collections.emptyMap(), + Collections.emptyMap() + ); + + public final long localEpoch; + public final Map<String, SortedSet<Integer>> activeTasks; + public final Map<String, SortedSet<Integer>> standbyTasks; + public final Map<String, SortedSet<Integer>> warmupTasks; + + public LocalAssignment(final long localEpoch, + final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + this.localEpoch = localEpoch; + this.activeTasks = activeTasks; + this.standbyTasks = standbyTasks; + this.warmupTasks = warmupTasks; + if (localEpoch == NONE_EPOCH && + (!activeTasks.isEmpty() || !standbyTasks.isEmpty() || !warmupTasks.isEmpty())) { + throw new IllegalArgumentException("Local epoch must be set if tasks are assigned."); + } + } + + Optional<LocalAssignment> updateWith(final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + if (localEpoch != NONE_EPOCH) { + if (activeTasks.equals(this.activeTasks) && + standbyTasks.equals(this.standbyTasks) && + warmupTasks.equals(this.warmupTasks)) { + + return Optional.empty(); + } + } + + long nextLocalEpoch = localEpoch + 1; + return Optional.of(new LocalAssignment(nextLocalEpoch, activeTasks, standbyTasks, warmupTasks)); + } + + @Override + public String toString() { + return "LocalAssignment{" + + "localEpoch=" + localEpoch + + ", activeTasks=" + activeTasks + + ", standbyTasks=" + standbyTasks + + ", warmupTasks=" + warmupTasks + + '}'; + } + + @Override + public boolean equals(Object o) { + if (this == o) return true; + if (o == null || getClass() != o.getClass()) return false; + LocalAssignment that = (LocalAssignment) o; + return localEpoch == that.localEpoch && + Objects.equals(activeTasks, that.activeTasks) && + Objects.equals(standbyTasks, that.standbyTasks) && + Objects.equals(warmupTasks, that.warmupTasks); + } + + @Override + public int hashCode() { + return Objects.hash(localEpoch, activeTasks, standbyTasks, warmupTasks); + } + } + + static final Utils.TopicPartitionComparator TOPIC_PARTITION_COMPARATOR = new Utils.TopicPartitionComparator(); + + private final Logger log; + + private final StreamsAssignmentInterface streamsAssignmentInterface; + + private final SubscriptionState subscriptionState; + + private final ConsumerMetadata consumerMetadata; + + private final BackgroundEventHandler backgroundEventHandler; + + private final Map<String, Uuid> assignedTopicIdCache = new HashMap<>(); + + private MemberState state; + + private final String groupId; + + private String memberId = ""; + + private final Optional<String> groupInstanceId = Optional.empty(); Review Comment: General point. It seems like you copied over a lot of code, but you did not copy the javadoc comments. Why? ########## clients/src/main/java/org/apache/kafka/clients/consumer/internals/StreamsMembershipManager.java: ########## @@ -0,0 +1,823 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.kafka.clients.consumer.internals; + +import org.apache.kafka.clients.consumer.internals.events.BackgroundEventHandler; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackCompletedEvent; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackNeededEvent; +import org.apache.kafka.clients.consumer.internals.metrics.ConsumerRebalanceMetricsManager; +import org.apache.kafka.clients.consumer.internals.metrics.RebalanceMetricsManager; +import org.apache.kafka.common.KafkaException; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.Uuid; +import org.apache.kafka.common.message.StreamsGroupHeartbeatResponseData; +import org.apache.kafka.common.metrics.Metrics; +import org.apache.kafka.common.protocol.Errors; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatRequest; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatResponse; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryProvider; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryReporter; +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.common.utils.Time; +import org.slf4j.Logger; + +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Optional; +import java.util.SortedSet; +import java.util.TreeSet; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +public class StreamsMembershipManager implements RequestManager { + + private static class LocalAssignment { + public static final long NONE_EPOCH = -1; + public static final LocalAssignment NONE = new LocalAssignment( + NONE_EPOCH, + Collections.emptyMap(), + Collections.emptyMap(), + Collections.emptyMap() + ); + + public final long localEpoch; + public final Map<String, SortedSet<Integer>> activeTasks; + public final Map<String, SortedSet<Integer>> standbyTasks; + public final Map<String, SortedSet<Integer>> warmupTasks; + + public LocalAssignment(final long localEpoch, + final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + this.localEpoch = localEpoch; + this.activeTasks = activeTasks; + this.standbyTasks = standbyTasks; + this.warmupTasks = warmupTasks; + if (localEpoch == NONE_EPOCH && + (!activeTasks.isEmpty() || !standbyTasks.isEmpty() || !warmupTasks.isEmpty())) { + throw new IllegalArgumentException("Local epoch must be set if tasks are assigned."); + } + } + + Optional<LocalAssignment> updateWith(final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + if (localEpoch != NONE_EPOCH) { + if (activeTasks.equals(this.activeTasks) && + standbyTasks.equals(this.standbyTasks) && + warmupTasks.equals(this.warmupTasks)) { + + return Optional.empty(); + } + } + + long nextLocalEpoch = localEpoch + 1; + return Optional.of(new LocalAssignment(nextLocalEpoch, activeTasks, standbyTasks, warmupTasks)); + } + + @Override + public String toString() { + return "LocalAssignment{" + + "localEpoch=" + localEpoch + + ", activeTasks=" + activeTasks + + ", standbyTasks=" + standbyTasks + + ", warmupTasks=" + warmupTasks + + '}'; + } + + @Override + public boolean equals(Object o) { + if (this == o) return true; + if (o == null || getClass() != o.getClass()) return false; + LocalAssignment that = (LocalAssignment) o; + return localEpoch == that.localEpoch && + Objects.equals(activeTasks, that.activeTasks) && + Objects.equals(standbyTasks, that.standbyTasks) && + Objects.equals(warmupTasks, that.warmupTasks); + } + + @Override + public int hashCode() { + return Objects.hash(localEpoch, activeTasks, standbyTasks, warmupTasks); + } + } + + static final Utils.TopicPartitionComparator TOPIC_PARTITION_COMPARATOR = new Utils.TopicPartitionComparator(); + + private final Logger log; + + private final StreamsAssignmentInterface streamsAssignmentInterface; + + private final SubscriptionState subscriptionState; + + private final ConsumerMetadata consumerMetadata; + + private final BackgroundEventHandler backgroundEventHandler; + + private final Map<String, Uuid> assignedTopicIdCache = new HashMap<>(); + + private MemberState state; + + private final String groupId; + + private String memberId = ""; + + private final Optional<String> groupInstanceId = Optional.empty(); + + private int memberEpoch = 0; + + private Optional<CompletableFuture<Void>> leaveGroupInProgress = Optional.empty(); + + private CompletableFuture<Void> staleMemberAssignmentRelease; + + private boolean reconciliationInProgress; + + private boolean rejoinedWhileReconciliationInProgress; + + private final Optional<ClientTelemetryReporter> clientTelemetryReporter; + + private LocalAssignment targetAssignment = LocalAssignment.NONE; + + private LocalAssignment currentAssignment = LocalAssignment.NONE; + + private final AtomicBoolean subscriptionUpdated = new AtomicBoolean(false); + + private final RebalanceMetricsManager metricsManager; + + private final Time time; + + private boolean isPollTimerExpired; + + public StreamsMembershipManager(final String groupId, + final StreamsAssignmentInterface streamsAssignmentInterface, + final ConsumerMetadata metadata, + final SubscriptionState subscriptionState, + final LogContext logContext, + final Optional<ClientTelemetryReporter> clientTelemetryReporter, + final BackgroundEventHandler backgroundEventHandler, + final Time time, + final Metrics metrics) { + log = logContext.logger(StreamsMembershipManager.class); + this.state = MemberState.UNSUBSCRIBED; + this.groupId = groupId; + this.streamsAssignmentInterface = streamsAssignmentInterface; + this.consumerMetadata = metadata; + this.subscriptionState = subscriptionState; + this.clientTelemetryReporter = clientTelemetryReporter; + this.backgroundEventHandler = backgroundEventHandler; + metricsManager = new ConsumerRebalanceMetricsManager(metrics); + this.time = time; + } + + public String groupId() { + return groupId; + } + + public String memberId() { + return memberId; + } + + public Optional<String> groupInstanceId() { + return groupInstanceId; + } + + public int memberEpoch() { + return memberEpoch; + } + + public MemberState state() { + return state; + } + + public boolean isLeavingGroup() { + MemberState state = state(); + return state == MemberState.PREPARE_LEAVING || state == MemberState.LEAVING; + } + + private boolean isNotInGroup() { + MemberState state = state(); + return state == MemberState.UNSUBSCRIBED || + state == MemberState.FENCED || + state == MemberState.FATAL || + state == MemberState.STALE; + } + + private void transitionToJoining() { + if (state == MemberState.FATAL) { + log.warn("No action taken to join the group with the updated subscription because " + + "the member is in FATAL state"); + return; + } + if (reconciliationInProgress) { + rejoinedWhileReconciliationInProgress = true; + } + resetEpoch(); + transitionTo(MemberState.JOINING); + clearPendingTaskAssignment(); + } + + private void transitionToSendingLeaveGroup(boolean dueToExpiredPollTimer) { + if (state == MemberState.FATAL) { + log.warn("Member {} with epoch {} won't send leave group request because it is in " + + "FATAL state", memberIdInfoForLog(), memberEpoch); + return; + } + if (state == MemberState.UNSUBSCRIBED) { + log.warn("Member {} won't send leave group request because it is already out of the group.", + memberIdInfoForLog()); + return; + } + + if (dueToExpiredPollTimer) { + isPollTimerExpired = true; + // Briefly transition through prepare leaving. The member does not have to release + // any assignment before sending the leave group given that is stale. It will invoke + // onTaskAssignment with empty assignment after sending the leave group on the STALE state. + transitionTo(MemberState.PREPARE_LEAVING); + } + finalizeLeaving(); + transitionTo(MemberState.LEAVING); + } + + private void finalizeLeaving() { + updateMemberEpoch(StreamsGroupHeartbeatRequest.LEAVE_GROUP_MEMBER_EPOCH); + clearPendingTaskAssignment(); + } + + private void transitionToStale() { + transitionTo(MemberState.STALE); + + CompletableFuture<Void> onAllTasksRevokedDone = invokeRevokingAllTasksCallback(); + staleMemberAssignmentRelease = onAllTasksRevokedDone.whenComplete((result, error) -> { + if (error != null) { + log.error("Task revocation callback invocation failed " + + "after member left group due to expired poll timer.", error); + } + clearTaskAndPartitionAssignment(); + log.debug("Member {} sent leave group heartbeat and released its assignment. It will remain " + + "in {} state until the poll timer is reset, and it will then rejoin the group", + memberIdInfoForLog(), MemberState.STALE); + }); + } + + public void transitionToFatal() { + MemberState previousState = state; + transitionTo(MemberState.FATAL); + log.error("Member {} with epoch {} transitioned to fatal state", memberIdInfoForLog(), memberEpoch); + + if (previousState == MemberState.UNSUBSCRIBED) { + log.debug("Member {} with epoch {} got fatal error from the broker but it already " + + "left the group, so onTaskAssignment callback won't be triggered.", memberIdInfoForLog(), memberEpoch); + return; + } + + if (previousState == MemberState.LEAVING || previousState == MemberState.PREPARE_LEAVING) { + log.info("Member {} with epoch {} was leaving the group with state {} when it got a " + + "fatal error from the broker. It will discard the ongoing leave and remain in " + + "fatal state.", memberIdInfoForLog(), memberEpoch, previousState); + maybeCompleteLeaveInProgress(); + return; + } + + CompletableFuture<Void> callbackResult = invokeRevokingAllTasksCallback(); + callbackResult.whenComplete((result, error) -> { + if (error != null) { + log.error("onTaskAssignment callback invocation failed while releasing assignment" + + "after member failed with fatal error.", error); + } + clearTaskAndPartitionAssignment(); + }); + } + + public void transitionToUnsubscribeIfLeaving() { + if (state == MemberState.LEAVING) { + log.warn("Heartbeat to leave group cannot be sent (most probably due to coordinator " + + "not known/available). Member {} with epoch {} will transition to {}.", + memberIdInfoForLog(), memberEpoch, MemberState.UNSUBSCRIBED); + transitionTo(MemberState.UNSUBSCRIBED); + maybeCompleteLeaveInProgress(); + } + } + + private void transitionTo(MemberState nextState) { + if (!state.equals(nextState) && !nextState.getPreviousValidStates().contains(state)) { + throw new IllegalStateException(String.format("Invalid state transition from %s to %s", + state, nextState)); + } + + if (isCompletingRebalance(state, nextState)) { + metricsManager.recordRebalanceEnded(time.milliseconds()); + } + if (isStartingRebalance(state, nextState)) { + metricsManager.recordRebalanceStarted(time.milliseconds()); + } + + log.info("Member {} with epoch {} transitioned from {} to {}.", memberIdInfoForLog(), memberEpoch, state, nextState); + this.state = nextState; + } + + private static boolean isCompletingRebalance(MemberState currentState, MemberState nextState) { + return currentState == MemberState.RECONCILING && + (nextState == MemberState.STABLE || nextState == MemberState.ACKNOWLEDGING); + } + + private static boolean isStartingRebalance(MemberState currentState, MemberState nextState) { + return currentState != MemberState.RECONCILING && nextState == MemberState.RECONCILING; + } + + private void resetEpoch() { + updateMemberEpoch(StreamsGroupHeartbeatRequest.JOIN_GROUP_MEMBER_EPOCH); + } + + private void updateMemberEpoch(int newEpoch) { + memberEpoch = newEpoch; + } + + private void clearPendingTaskAssignment() { + currentAssignment = LocalAssignment.NONE; + } + + private void clearTaskAndPartitionAssignment() { + subscriptionState.assignFromSubscribed(Collections.emptySet()); + currentAssignment = LocalAssignment.NONE; + targetAssignment = LocalAssignment.NONE; + } + + public boolean shouldSkipHeartbeat() { + return isNotInGroup(); + } + + public boolean shouldHeartbeatNow() { + MemberState state = state(); + return state == MemberState.ACKNOWLEDGING || state == MemberState.LEAVING || state == MemberState.JOINING; + } + + public void onSubscriptionUpdated() { + subscriptionUpdated.compareAndSet(false, true); + } + + public void onConsumerPoll() { + if (subscriptionUpdated.compareAndSet(true, false) && state == MemberState.UNSUBSCRIBED) { + transitionToJoining(); + } + } + + public void onHeartbeatRequestGenerated() { + MemberState state = state(); + if (state == MemberState.ACKNOWLEDGING) { + if (targetAssignmentReconciled()) { + transitionTo(MemberState.STABLE); + } else { + log.debug("Member {} with epoch {} transitioned to {} after a heartbeat was sent " + + "to ack a previous reconciliation. New assignments are ready to " + + "be reconciled.", memberIdInfoForLog(), memberEpoch, MemberState.RECONCILING); + transitionTo(MemberState.RECONCILING); + } + } else if (state == MemberState.LEAVING) { + if (isPollTimerExpired) { + log.debug("Member {} with epoch {} generated the heartbeat to leave due to expired poll timer. It will " + + "remain stale (no heartbeat) until it rejoins the group on the next consumer " + + "poll.", memberIdInfoForLog(), memberEpoch); + transitionToStale(); + } else { + log.debug("Member {} with epoch {} generated the heartbeat to leave the group.", memberIdInfoForLog(), memberEpoch); + transitionTo(MemberState.UNSUBSCRIBED); + } + } + } + + public void onHeartbeatSuccess(StreamsGroupHeartbeatResponse response) { + StreamsGroupHeartbeatResponseData responseData = response.data(); + throwIfUnexpectedError(responseData); + if (state == MemberState.LEAVING) { + log.debug("Ignoring heartbeat response received from broker. Member {} with epoch {} is " + + "already leaving the group.", memberId, memberEpoch); + return; + } + if (state == MemberState.UNSUBSCRIBED && maybeCompleteLeaveInProgress()) { + log.debug("Member {} with epoch {} received a successful response to the heartbeat " + + "to leave the group and completed the leave operation. ", memberId, memberEpoch); + return; + } + if (isNotInGroup()) { + log.debug("Ignoring heartbeat response received from broker. Member {} is in {} state" + + " so it's not a member of the group. ", memberId, state); + return; + } + + // Update the group member id label in the client telemetry reporter if the member id has + // changed. Initially the member id is empty, and it is updated when the member joins the + // group. This is done here to avoid updating the label on every heartbeat response. Also + // check if the member id is null, as the schema defines it as nullable. + if (responseData.memberId() != null && !responseData.memberId().equals(memberId)) { + clientTelemetryReporter.ifPresent(reporter -> reporter.updateMetricsLabels( + Collections.singletonMap(ClientTelemetryProvider.GROUP_MEMBER_ID, responseData.memberId()))); + } + + memberId = responseData.memberId(); + updateMemberEpoch(responseData.memberEpoch()); + + final List<StreamsGroupHeartbeatResponseData.TaskIds> activeTasks = responseData.activeTasks(); + final List<StreamsGroupHeartbeatResponseData.TaskIds> standbyTasks = responseData.standbyTasks(); + final List<StreamsGroupHeartbeatResponseData.TaskIds> warmupTasks = responseData.warmupTasks(); + + if (activeTasks != null && standbyTasks != null && warmupTasks != null) { + + if (!state.canHandleNewAssignment()) { + log.debug("Ignoring new assignment: active tasks {}, standby tasks {}, and warm-up tasks {} received " + + "from server because member is in {} state.", + activeTasks, standbyTasks, warmupTasks, state); + return; + } + + processAssignmentReceived( + toTasksAssignment(activeTasks), + toTasksAssignment(standbyTasks), + toTasksAssignment(warmupTasks) + ); + } else { + if (responseData.activeTasks() != null || + responseData.standbyTasks() != null || + responseData.warmupTasks() != null) { + + throw new IllegalStateException("Invalid response data, task collections must be all null or all non-null: " + + responseData); + } + } + } + + public void onHeartbeatFailure(boolean retriable) { + if (!retriable) { + metricsManager.maybeRecordRebalanceFailed(); + } + // The leave group request is sent out once (not retried), so we should complete the leave + // operation once the request completes, regardless of the response. + if (state == MemberState.UNSUBSCRIBED && maybeCompleteLeaveInProgress()) { + log.warn("Member {} with epoch {} received a failed response to the heartbeat to " + + "leave the group and completed the leave operation. ", memberIdInfoForLog(), memberEpoch); + } + } + + public void onPollTimerExpired() { + transitionToSendingLeaveGroup(true); + } + + public void onFenced() { + if (state == MemberState.PREPARE_LEAVING) { + log.info("Member {} with epoch {} got fenced but it is already preparing to leave " + + "the group, so it will stop sending heartbeat and won't attempt to send the " + + "leave request or rejoin.", memberIdInfoForLog(), memberEpoch); + finalizeLeaving(); + transitionTo(MemberState.UNSUBSCRIBED); + maybeCompleteLeaveInProgress(); + return; + } + + if (state == MemberState.LEAVING) { + log.debug("Member {} with epoch {} got fenced before sending leave group heartbeat. " + + "It will not send the leave request and won't attempt to rejoin.", memberIdInfoForLog(), memberEpoch); + transitionTo(MemberState.UNSUBSCRIBED); + maybeCompleteLeaveInProgress(); + return; + } + if (state == MemberState.UNSUBSCRIBED) { + log.debug("Member {} with epoch {} got fenced but it already left the group, so it " + + "won't attempt to rejoin.", memberIdInfoForLog(), memberEpoch); + return; + } + transitionTo(MemberState.FENCED); + resetEpoch(); + log.debug("Member {} with epoch {} transitioned to {} state. It will release its " + + "assignment and rejoin the group.", memberIdInfoForLog(), memberEpoch, MemberState.FENCED); + + CompletableFuture<Void> callbackResult = invokeRevokingAllTasksCallback(); + callbackResult.whenComplete((result, error) -> { + if (error != null) { + log.error("onTaskAssignment callback invocation failed while releasing assignment" + + " after member got fenced. Member will rejoin the group anyways.", error); + } + clearTaskAndPartitionAssignment(); + if (state == MemberState.FENCED) { + transitionToJoining(); + } else { + log.debug("Fenced member onTaskAssignment callback completed but the state has " + + "already changed to {}, so the member won't rejoin the group", state); + } + }); + } + + private void throwIfUnexpectedError(StreamsGroupHeartbeatResponseData responseData) { + if (responseData.errorCode() != Errors.NONE.code()) { + String errorMessage = String.format( + "Unexpected error in Heartbeat response. Expected no error, but received: %s with message: '%s'", + Errors.forCode(responseData.errorCode()), responseData.errorMessage() + ); + throw new IllegalArgumentException(errorMessage); + } + } + + public void maybeRejoinStaleMember() { + isPollTimerExpired = false; + if (state == MemberState.STALE) { + log.debug("Expired poll timer has been reset so stale member {} will rejoin the group " + + "when it completes releasing its previous assignment.", memberIdInfoForLog()); + staleMemberAssignmentRelease.whenComplete((__, error) -> transitionToJoining()); + } + } + + private boolean maybeCompleteLeaveInProgress() { + if (leaveGroupInProgress.isPresent()) { + leaveGroupInProgress.get().complete(null); + leaveGroupInProgress = Optional.empty(); + return true; + } + return false; + } + + private static SortedSet<StreamsAssignmentInterface.TaskId> toTaskIdSet(final Map<String, SortedSet<Integer>> tasks) { + SortedSet<StreamsAssignmentInterface.TaskId> taskIdSet = new TreeSet<>(); + for (final Map.Entry<String, SortedSet<Integer>> task : tasks.entrySet()) { + final String subtopologyId = task.getKey(); + final SortedSet<Integer> partitions = task.getValue(); + for (final int partition : partitions) { + taskIdSet.add(new StreamsAssignmentInterface.TaskId(subtopologyId, partition)); + } + } + return taskIdSet; + } + + private static Map<String, SortedSet<Integer>> toTasksAssignment(final List<StreamsGroupHeartbeatResponseData.TaskIds> taskIds) { + return taskIds.stream() + .collect(Collectors.toMap(StreamsGroupHeartbeatResponseData.TaskIds::subtopologyId, taskId -> new TreeSet<>(taskId.partitions()))); + } + + /** + * Leaves the group. + * + * <p> + * This method does the following: + * <ol> + * <li>Transitions member state to {@link MemberState#PREPARE_LEAVING}.</li> + * <li>Requests the invocation of the revocation callback.</li> + * <li>Once the revocation callback completes, it clears the current and target assignment, unsubscribes from + * all topics and transitions the member state to {@link MemberState#LEAVING}.</li> + * </ol> + * States {@link MemberState#PREPARE_LEAVING} and {@link MemberState#LEAVING} cause the heartbeat request manager + * to send a leave group heartbeat. + * </p> + * + * @return future that will complete when the revocation callback execution completes and the heartbeat + * to leave the group has been sent out. + */ + public CompletableFuture<Void> leaveGroup() { + if (isNotInGroup()) { + if (state == MemberState.FENCED) { + clearTaskAndPartitionAssignment(); + transitionTo(MemberState.UNSUBSCRIBED); + } + subscriptionState.unsubscribe(); + return CompletableFuture.completedFuture(null); + } + + if (state == MemberState.PREPARE_LEAVING || state == MemberState.LEAVING) { + log.debug("Leave group operation already in progress for member {}", memberIdInfoForLog()); + return leaveGroupInProgress.get(); + } + + CompletableFuture<Void> onGroupLeft = new CompletableFuture<>(); + leaveGroupInProgress = Optional.of(onGroupLeft); + CompletableFuture<Void> onAllTasksRevokedDone = prepareLeaving(); + onAllTasksRevokedDone.whenComplete((__, callbackError) -> leaving(callbackError)); + + return onGroupLeft; + } + + private CompletableFuture<Void> prepareLeaving() { + transitionTo(MemberState.PREPARE_LEAVING); + return invokeRevokingAllTasksCallback(); + } + + private void leaving(Throwable callbackError) { + if (callbackError != null) { + log.error("Member {} callback to revoke task assignment failed. It will proceed " + + "to clear its assignment and send a leave group heartbeat", + memberIdInfoForLog(), callbackError); + } else { + log.info("Member {} completed callback to revoke task assignment. It will proceed " + + "to clear its assignment and send a leave group heartbeat", + memberIdInfoForLog()); + } + subscriptionState.unsubscribe(); + clearTaskAndPartitionAssignment(); + transitionToSendingLeaveGroup(false); + } + + /** + * This will process the assignment received if it is different from the member's current + * assignment. If a new assignment is received, this will make sure reconciliation is attempted + * on the next call of `poll`. If another reconciliation is currently in process, the first `poll` + * after that reconciliation will trigger the new reconciliation. + * + * @param activeTasks Target active tasks assignment received from the broker. + * @param standbyTasks Target standby tasks assignment received from the broker. + * @param warmupTasks Target warm-up tasks assignment received from the broker. + */ + private void processAssignmentReceived(Map<String, SortedSet<Integer>> activeTasks, + Map<String, SortedSet<Integer>> standbyTasks, + Map<String, SortedSet<Integer>> warmupTasks) { + replaceTargetAssignmentWithNewAssignment(activeTasks, standbyTasks, warmupTasks); + if (!targetAssignmentReconciled()) { + transitionTo(MemberState.RECONCILING); + } else { + log.debug("Target assignment {} received from the broker is equals to the member " + + "current assignment {}. Nothing to reconcile.", + targetAssignment, currentAssignment); + // Make sure we transition the member back to STABLE if it was RECONCILING (ex. + // member was RECONCILING unresolved assignments that were just removed by the + // broker), or JOINING (member joining received empty assignment). + if (state == MemberState.RECONCILING || state == MemberState.JOINING) { + transitionTo(MemberState.STABLE); + } + } + } + + private boolean targetAssignmentReconciled() { + return currentAssignment.equals(targetAssignment); + } + + private void replaceTargetAssignmentWithNewAssignment(Map<String, SortedSet<Integer>> activeTasks, + Map<String, SortedSet<Integer>> standbyTasks, + Map<String, SortedSet<Integer>> warmupTasks) { + targetAssignment.updateWith(activeTasks, standbyTasks, warmupTasks) + .ifPresent(updatedAssignment -> { + log.debug("Target assignment updated from {} to {}. Member will reconcile it on the next poll.", + targetAssignment, updatedAssignment); + targetAssignment = updatedAssignment; + }); + } + + @Override + public NetworkClientDelegate.PollResult poll(long currentTimeMs) { + if (state == MemberState.RECONCILING) { + maybeReconcile(); + } + return NetworkClientDelegate.PollResult.EMPTY; + } + + private void maybeReconcile() { + if (targetAssignmentReconciled()) { + log.trace("Ignoring reconciliation attempt. Target assignment is equal to the " + + "current assignment."); + return; + } + if (reconciliationInProgress) { + log.trace("Ignoring reconciliation attempt. Another reconciliation is already in progress. Assignment " + + targetAssignment + " will be handled in the next reconciliation loop."); + return; + } + + markReconciliationInProgress(); + + // ToDo: add standby and warmup tasks + SortedSet<StreamsAssignmentInterface.TaskId> assignedActiveTasks = toTaskIdSet(targetAssignment.activeTasks); + + log.info("Assigned tasks with local epoch {}\n" + + "\tMember: {}\n" + + "\tActive tasks: {}\n", + targetAssignment.localEpoch, + memberIdInfoForLog(), + assignedActiveTasks + ); + + SortedSet<TopicPartition> ownedTopicPartitions = new TreeSet<>(TOPIC_PARTITION_COMPARATOR); + ownedTopicPartitions.addAll(subscriptionState.assignedPartitions()); + SortedSet<TopicPartition> assignedTopicPartitions = topicPartitionsForActiveTasks(targetAssignment.activeTasks); + SortedSet<TopicPartition> assignedTopicPartitionsNotPreviouslyOwned = + assignedTopicPartitionsNotPreviouslyOwned(assignedTopicPartitions, ownedTopicPartitions); + + subscriptionState.assignFromSubscribedAwaitingCallback( + assignedTopicPartitions, + assignedTopicPartitionsNotPreviouslyOwned + ); + + final StreamsOnAssignmentCallbackNeededEvent onAssignmentCallbackNeededEvent = + new StreamsOnAssignmentCallbackNeededEvent(new StreamsAssignmentInterface.Assignment( + assignedActiveTasks, + Collections.emptySet(), Review Comment: This is missing warmups and standbys ########## clients/src/main/java/org/apache/kafka/clients/consumer/internals/StreamsMembershipManager.java: ########## @@ -0,0 +1,823 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.kafka.clients.consumer.internals; + +import org.apache.kafka.clients.consumer.internals.events.BackgroundEventHandler; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackCompletedEvent; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackNeededEvent; +import org.apache.kafka.clients.consumer.internals.metrics.ConsumerRebalanceMetricsManager; +import org.apache.kafka.clients.consumer.internals.metrics.RebalanceMetricsManager; +import org.apache.kafka.common.KafkaException; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.Uuid; +import org.apache.kafka.common.message.StreamsGroupHeartbeatResponseData; +import org.apache.kafka.common.metrics.Metrics; +import org.apache.kafka.common.protocol.Errors; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatRequest; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatResponse; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryProvider; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryReporter; +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.common.utils.Time; +import org.slf4j.Logger; + +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Optional; +import java.util.SortedSet; +import java.util.TreeSet; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +public class StreamsMembershipManager implements RequestManager { + + private static class LocalAssignment { + public static final long NONE_EPOCH = -1; + public static final LocalAssignment NONE = new LocalAssignment( + NONE_EPOCH, + Collections.emptyMap(), + Collections.emptyMap(), + Collections.emptyMap() + ); + + public final long localEpoch; + public final Map<String, SortedSet<Integer>> activeTasks; + public final Map<String, SortedSet<Integer>> standbyTasks; + public final Map<String, SortedSet<Integer>> warmupTasks; + + public LocalAssignment(final long localEpoch, + final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + this.localEpoch = localEpoch; + this.activeTasks = activeTasks; + this.standbyTasks = standbyTasks; + this.warmupTasks = warmupTasks; + if (localEpoch == NONE_EPOCH && + (!activeTasks.isEmpty() || !standbyTasks.isEmpty() || !warmupTasks.isEmpty())) { + throw new IllegalArgumentException("Local epoch must be set if tasks are assigned."); + } + } + + Optional<LocalAssignment> updateWith(final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + if (localEpoch != NONE_EPOCH) { + if (activeTasks.equals(this.activeTasks) && + standbyTasks.equals(this.standbyTasks) && + warmupTasks.equals(this.warmupTasks)) { + + return Optional.empty(); + } + } + + long nextLocalEpoch = localEpoch + 1; + return Optional.of(new LocalAssignment(nextLocalEpoch, activeTasks, standbyTasks, warmupTasks)); + } + + @Override + public String toString() { + return "LocalAssignment{" + + "localEpoch=" + localEpoch + + ", activeTasks=" + activeTasks + + ", standbyTasks=" + standbyTasks + + ", warmupTasks=" + warmupTasks + + '}'; + } + + @Override + public boolean equals(Object o) { + if (this == o) return true; + if (o == null || getClass() != o.getClass()) return false; + LocalAssignment that = (LocalAssignment) o; + return localEpoch == that.localEpoch && + Objects.equals(activeTasks, that.activeTasks) && + Objects.equals(standbyTasks, that.standbyTasks) && + Objects.equals(warmupTasks, that.warmupTasks); + } + + @Override + public int hashCode() { + return Objects.hash(localEpoch, activeTasks, standbyTasks, warmupTasks); + } + } + + static final Utils.TopicPartitionComparator TOPIC_PARTITION_COMPARATOR = new Utils.TopicPartitionComparator(); + + private final Logger log; + + private final StreamsAssignmentInterface streamsAssignmentInterface; + + private final SubscriptionState subscriptionState; + + private final ConsumerMetadata consumerMetadata; + + private final BackgroundEventHandler backgroundEventHandler; + + private final Map<String, Uuid> assignedTopicIdCache = new HashMap<>(); + + private MemberState state; + + private final String groupId; + + private String memberId = ""; + + private final Optional<String> groupInstanceId = Optional.empty(); + + private int memberEpoch = 0; + + private Optional<CompletableFuture<Void>> leaveGroupInProgress = Optional.empty(); + + private CompletableFuture<Void> staleMemberAssignmentRelease; + + private boolean reconciliationInProgress; + + private boolean rejoinedWhileReconciliationInProgress; + + private final Optional<ClientTelemetryReporter> clientTelemetryReporter; + + private LocalAssignment targetAssignment = LocalAssignment.NONE; + + private LocalAssignment currentAssignment = LocalAssignment.NONE; + + private final AtomicBoolean subscriptionUpdated = new AtomicBoolean(false); + + private final RebalanceMetricsManager metricsManager; + + private final Time time; + + private boolean isPollTimerExpired; + + public StreamsMembershipManager(final String groupId, + final StreamsAssignmentInterface streamsAssignmentInterface, + final ConsumerMetadata metadata, + final SubscriptionState subscriptionState, + final LogContext logContext, + final Optional<ClientTelemetryReporter> clientTelemetryReporter, + final BackgroundEventHandler backgroundEventHandler, + final Time time, + final Metrics metrics) { + log = logContext.logger(StreamsMembershipManager.class); + this.state = MemberState.UNSUBSCRIBED; + this.groupId = groupId; + this.streamsAssignmentInterface = streamsAssignmentInterface; + this.consumerMetadata = metadata; + this.subscriptionState = subscriptionState; + this.clientTelemetryReporter = clientTelemetryReporter; + this.backgroundEventHandler = backgroundEventHandler; + metricsManager = new ConsumerRebalanceMetricsManager(metrics); + this.time = time; + } + + public String groupId() { + return groupId; + } + + public String memberId() { + return memberId; + } + + public Optional<String> groupInstanceId() { + return groupInstanceId; + } + + public int memberEpoch() { + return memberEpoch; + } + + public MemberState state() { + return state; + } + + public boolean isLeavingGroup() { + MemberState state = state(); + return state == MemberState.PREPARE_LEAVING || state == MemberState.LEAVING; + } + + private boolean isNotInGroup() { + MemberState state = state(); + return state == MemberState.UNSUBSCRIBED || + state == MemberState.FENCED || + state == MemberState.FATAL || + state == MemberState.STALE; + } + + private void transitionToJoining() { + if (state == MemberState.FATAL) { + log.warn("No action taken to join the group with the updated subscription because " + + "the member is in FATAL state"); + return; + } + if (reconciliationInProgress) { + rejoinedWhileReconciliationInProgress = true; + } + resetEpoch(); + transitionTo(MemberState.JOINING); + clearPendingTaskAssignment(); + } + + private void transitionToSendingLeaveGroup(boolean dueToExpiredPollTimer) { + if (state == MemberState.FATAL) { + log.warn("Member {} with epoch {} won't send leave group request because it is in " + + "FATAL state", memberIdInfoForLog(), memberEpoch); + return; + } + if (state == MemberState.UNSUBSCRIBED) { + log.warn("Member {} won't send leave group request because it is already out of the group.", + memberIdInfoForLog()); + return; + } + + if (dueToExpiredPollTimer) { + isPollTimerExpired = true; + // Briefly transition through prepare leaving. The member does not have to release + // any assignment before sending the leave group given that is stale. It will invoke + // onTaskAssignment with empty assignment after sending the leave group on the STALE state. + transitionTo(MemberState.PREPARE_LEAVING); + } + finalizeLeaving(); + transitionTo(MemberState.LEAVING); + } + + private void finalizeLeaving() { + updateMemberEpoch(StreamsGroupHeartbeatRequest.LEAVE_GROUP_MEMBER_EPOCH); + clearPendingTaskAssignment(); + } + + private void transitionToStale() { + transitionTo(MemberState.STALE); + + CompletableFuture<Void> onAllTasksRevokedDone = invokeRevokingAllTasksCallback(); + staleMemberAssignmentRelease = onAllTasksRevokedDone.whenComplete((result, error) -> { + if (error != null) { + log.error("Task revocation callback invocation failed " + + "after member left group due to expired poll timer.", error); + } + clearTaskAndPartitionAssignment(); + log.debug("Member {} sent leave group heartbeat and released its assignment. It will remain " + + "in {} state until the poll timer is reset, and it will then rejoin the group", + memberIdInfoForLog(), MemberState.STALE); + }); + } + + public void transitionToFatal() { + MemberState previousState = state; + transitionTo(MemberState.FATAL); + log.error("Member {} with epoch {} transitioned to fatal state", memberIdInfoForLog(), memberEpoch); + + if (previousState == MemberState.UNSUBSCRIBED) { + log.debug("Member {} with epoch {} got fatal error from the broker but it already " + + "left the group, so onTaskAssignment callback won't be triggered.", memberIdInfoForLog(), memberEpoch); + return; + } + + if (previousState == MemberState.LEAVING || previousState == MemberState.PREPARE_LEAVING) { + log.info("Member {} with epoch {} was leaving the group with state {} when it got a " + + "fatal error from the broker. It will discard the ongoing leave and remain in " + + "fatal state.", memberIdInfoForLog(), memberEpoch, previousState); + maybeCompleteLeaveInProgress(); + return; + } + + CompletableFuture<Void> callbackResult = invokeRevokingAllTasksCallback(); + callbackResult.whenComplete((result, error) -> { + if (error != null) { + log.error("onTaskAssignment callback invocation failed while releasing assignment" + + "after member failed with fatal error.", error); + } + clearTaskAndPartitionAssignment(); + }); + } + + public void transitionToUnsubscribeIfLeaving() { + if (state == MemberState.LEAVING) { + log.warn("Heartbeat to leave group cannot be sent (most probably due to coordinator " + + "not known/available). Member {} with epoch {} will transition to {}.", + memberIdInfoForLog(), memberEpoch, MemberState.UNSUBSCRIBED); + transitionTo(MemberState.UNSUBSCRIBED); + maybeCompleteLeaveInProgress(); + } + } + + private void transitionTo(MemberState nextState) { + if (!state.equals(nextState) && !nextState.getPreviousValidStates().contains(state)) { + throw new IllegalStateException(String.format("Invalid state transition from %s to %s", + state, nextState)); + } + + if (isCompletingRebalance(state, nextState)) { + metricsManager.recordRebalanceEnded(time.milliseconds()); + } + if (isStartingRebalance(state, nextState)) { + metricsManager.recordRebalanceStarted(time.milliseconds()); + } + + log.info("Member {} with epoch {} transitioned from {} to {}.", memberIdInfoForLog(), memberEpoch, state, nextState); + this.state = nextState; + } + + private static boolean isCompletingRebalance(MemberState currentState, MemberState nextState) { + return currentState == MemberState.RECONCILING && + (nextState == MemberState.STABLE || nextState == MemberState.ACKNOWLEDGING); + } + + private static boolean isStartingRebalance(MemberState currentState, MemberState nextState) { + return currentState != MemberState.RECONCILING && nextState == MemberState.RECONCILING; + } + + private void resetEpoch() { + updateMemberEpoch(StreamsGroupHeartbeatRequest.JOIN_GROUP_MEMBER_EPOCH); + } + + private void updateMemberEpoch(int newEpoch) { + memberEpoch = newEpoch; + } + + private void clearPendingTaskAssignment() { + currentAssignment = LocalAssignment.NONE; + } + + private void clearTaskAndPartitionAssignment() { + subscriptionState.assignFromSubscribed(Collections.emptySet()); + currentAssignment = LocalAssignment.NONE; + targetAssignment = LocalAssignment.NONE; + } + + public boolean shouldSkipHeartbeat() { + return isNotInGroup(); + } + + public boolean shouldHeartbeatNow() { + MemberState state = state(); + return state == MemberState.ACKNOWLEDGING || state == MemberState.LEAVING || state == MemberState.JOINING; + } + + public void onSubscriptionUpdated() { + subscriptionUpdated.compareAndSet(false, true); + } + + public void onConsumerPoll() { + if (subscriptionUpdated.compareAndSet(true, false) && state == MemberState.UNSUBSCRIBED) { + transitionToJoining(); + } + } + + public void onHeartbeatRequestGenerated() { + MemberState state = state(); + if (state == MemberState.ACKNOWLEDGING) { + if (targetAssignmentReconciled()) { + transitionTo(MemberState.STABLE); + } else { + log.debug("Member {} with epoch {} transitioned to {} after a heartbeat was sent " + + "to ack a previous reconciliation. New assignments are ready to " + + "be reconciled.", memberIdInfoForLog(), memberEpoch, MemberState.RECONCILING); + transitionTo(MemberState.RECONCILING); + } + } else if (state == MemberState.LEAVING) { + if (isPollTimerExpired) { + log.debug("Member {} with epoch {} generated the heartbeat to leave due to expired poll timer. It will " + + "remain stale (no heartbeat) until it rejoins the group on the next consumer " + + "poll.", memberIdInfoForLog(), memberEpoch); + transitionToStale(); + } else { + log.debug("Member {} with epoch {} generated the heartbeat to leave the group.", memberIdInfoForLog(), memberEpoch); + transitionTo(MemberState.UNSUBSCRIBED); + } + } + } + + public void onHeartbeatSuccess(StreamsGroupHeartbeatResponse response) { + StreamsGroupHeartbeatResponseData responseData = response.data(); + throwIfUnexpectedError(responseData); + if (state == MemberState.LEAVING) { + log.debug("Ignoring heartbeat response received from broker. Member {} with epoch {} is " + + "already leaving the group.", memberId, memberEpoch); + return; + } + if (state == MemberState.UNSUBSCRIBED && maybeCompleteLeaveInProgress()) { + log.debug("Member {} with epoch {} received a successful response to the heartbeat " + + "to leave the group and completed the leave operation. ", memberId, memberEpoch); + return; + } + if (isNotInGroup()) { + log.debug("Ignoring heartbeat response received from broker. Member {} is in {} state" + + " so it's not a member of the group. ", memberId, state); + return; + } + + // Update the group member id label in the client telemetry reporter if the member id has + // changed. Initially the member id is empty, and it is updated when the member joins the + // group. This is done here to avoid updating the label on every heartbeat response. Also + // check if the member id is null, as the schema defines it as nullable. + if (responseData.memberId() != null && !responseData.memberId().equals(memberId)) { + clientTelemetryReporter.ifPresent(reporter -> reporter.updateMetricsLabels( + Collections.singletonMap(ClientTelemetryProvider.GROUP_MEMBER_ID, responseData.memberId()))); + } + + memberId = responseData.memberId(); + updateMemberEpoch(responseData.memberEpoch()); + + final List<StreamsGroupHeartbeatResponseData.TaskIds> activeTasks = responseData.activeTasks(); + final List<StreamsGroupHeartbeatResponseData.TaskIds> standbyTasks = responseData.standbyTasks(); + final List<StreamsGroupHeartbeatResponseData.TaskIds> warmupTasks = responseData.warmupTasks(); + + if (activeTasks != null && standbyTasks != null && warmupTasks != null) { + + if (!state.canHandleNewAssignment()) { + log.debug("Ignoring new assignment: active tasks {}, standby tasks {}, and warm-up tasks {} received " + + "from server because member is in {} state.", + activeTasks, standbyTasks, warmupTasks, state); + return; + } + + processAssignmentReceived( + toTasksAssignment(activeTasks), + toTasksAssignment(standbyTasks), + toTasksAssignment(warmupTasks) + ); + } else { + if (responseData.activeTasks() != null || + responseData.standbyTasks() != null || + responseData.warmupTasks() != null) { + + throw new IllegalStateException("Invalid response data, task collections must be all null or all non-null: " + + responseData); + } + } + } + + public void onHeartbeatFailure(boolean retriable) { + if (!retriable) { + metricsManager.maybeRecordRebalanceFailed(); + } + // The leave group request is sent out once (not retried), so we should complete the leave + // operation once the request completes, regardless of the response. + if (state == MemberState.UNSUBSCRIBED && maybeCompleteLeaveInProgress()) { + log.warn("Member {} with epoch {} received a failed response to the heartbeat to " + + "leave the group and completed the leave operation. ", memberIdInfoForLog(), memberEpoch); + } + } + + public void onPollTimerExpired() { + transitionToSendingLeaveGroup(true); + } + + public void onFenced() { + if (state == MemberState.PREPARE_LEAVING) { + log.info("Member {} with epoch {} got fenced but it is already preparing to leave " + + "the group, so it will stop sending heartbeat and won't attempt to send the " + + "leave request or rejoin.", memberIdInfoForLog(), memberEpoch); + finalizeLeaving(); + transitionTo(MemberState.UNSUBSCRIBED); + maybeCompleteLeaveInProgress(); + return; + } + + if (state == MemberState.LEAVING) { + log.debug("Member {} with epoch {} got fenced before sending leave group heartbeat. " + + "It will not send the leave request and won't attempt to rejoin.", memberIdInfoForLog(), memberEpoch); + transitionTo(MemberState.UNSUBSCRIBED); + maybeCompleteLeaveInProgress(); + return; + } + if (state == MemberState.UNSUBSCRIBED) { + log.debug("Member {} with epoch {} got fenced but it already left the group, so it " + + "won't attempt to rejoin.", memberIdInfoForLog(), memberEpoch); + return; + } + transitionTo(MemberState.FENCED); + resetEpoch(); + log.debug("Member {} with epoch {} transitioned to {} state. It will release its " + + "assignment and rejoin the group.", memberIdInfoForLog(), memberEpoch, MemberState.FENCED); + + CompletableFuture<Void> callbackResult = invokeRevokingAllTasksCallback(); + callbackResult.whenComplete((result, error) -> { + if (error != null) { + log.error("onTaskAssignment callback invocation failed while releasing assignment" + + " after member got fenced. Member will rejoin the group anyways.", error); + } + clearTaskAndPartitionAssignment(); + if (state == MemberState.FENCED) { + transitionToJoining(); + } else { + log.debug("Fenced member onTaskAssignment callback completed but the state has " + + "already changed to {}, so the member won't rejoin the group", state); + } + }); + } + + private void throwIfUnexpectedError(StreamsGroupHeartbeatResponseData responseData) { + if (responseData.errorCode() != Errors.NONE.code()) { + String errorMessage = String.format( + "Unexpected error in Heartbeat response. Expected no error, but received: %s with message: '%s'", + Errors.forCode(responseData.errorCode()), responseData.errorMessage() + ); + throw new IllegalArgumentException(errorMessage); + } + } + + public void maybeRejoinStaleMember() { + isPollTimerExpired = false; + if (state == MemberState.STALE) { + log.debug("Expired poll timer has been reset so stale member {} will rejoin the group " + + "when it completes releasing its previous assignment.", memberIdInfoForLog()); + staleMemberAssignmentRelease.whenComplete((__, error) -> transitionToJoining()); + } + } + + private boolean maybeCompleteLeaveInProgress() { + if (leaveGroupInProgress.isPresent()) { + leaveGroupInProgress.get().complete(null); + leaveGroupInProgress = Optional.empty(); + return true; + } + return false; + } + + private static SortedSet<StreamsAssignmentInterface.TaskId> toTaskIdSet(final Map<String, SortedSet<Integer>> tasks) { + SortedSet<StreamsAssignmentInterface.TaskId> taskIdSet = new TreeSet<>(); + for (final Map.Entry<String, SortedSet<Integer>> task : tasks.entrySet()) { + final String subtopologyId = task.getKey(); + final SortedSet<Integer> partitions = task.getValue(); + for (final int partition : partitions) { + taskIdSet.add(new StreamsAssignmentInterface.TaskId(subtopologyId, partition)); + } + } + return taskIdSet; + } + + private static Map<String, SortedSet<Integer>> toTasksAssignment(final List<StreamsGroupHeartbeatResponseData.TaskIds> taskIds) { + return taskIds.stream() + .collect(Collectors.toMap(StreamsGroupHeartbeatResponseData.TaskIds::subtopologyId, taskId -> new TreeSet<>(taskId.partitions()))); + } + + /** + * Leaves the group. + * + * <p> + * This method does the following: + * <ol> + * <li>Transitions member state to {@link MemberState#PREPARE_LEAVING}.</li> + * <li>Requests the invocation of the revocation callback.</li> + * <li>Once the revocation callback completes, it clears the current and target assignment, unsubscribes from + * all topics and transitions the member state to {@link MemberState#LEAVING}.</li> + * </ol> + * States {@link MemberState#PREPARE_LEAVING} and {@link MemberState#LEAVING} cause the heartbeat request manager + * to send a leave group heartbeat. + * </p> + * + * @return future that will complete when the revocation callback execution completes and the heartbeat + * to leave the group has been sent out. + */ + public CompletableFuture<Void> leaveGroup() { + if (isNotInGroup()) { + if (state == MemberState.FENCED) { + clearTaskAndPartitionAssignment(); + transitionTo(MemberState.UNSUBSCRIBED); + } + subscriptionState.unsubscribe(); + return CompletableFuture.completedFuture(null); + } + + if (state == MemberState.PREPARE_LEAVING || state == MemberState.LEAVING) { + log.debug("Leave group operation already in progress for member {}", memberIdInfoForLog()); + return leaveGroupInProgress.get(); + } + + CompletableFuture<Void> onGroupLeft = new CompletableFuture<>(); + leaveGroupInProgress = Optional.of(onGroupLeft); + CompletableFuture<Void> onAllTasksRevokedDone = prepareLeaving(); + onAllTasksRevokedDone.whenComplete((__, callbackError) -> leaving(callbackError)); + + return onGroupLeft; + } + + private CompletableFuture<Void> prepareLeaving() { + transitionTo(MemberState.PREPARE_LEAVING); + return invokeRevokingAllTasksCallback(); + } + + private void leaving(Throwable callbackError) { + if (callbackError != null) { + log.error("Member {} callback to revoke task assignment failed. It will proceed " + + "to clear its assignment and send a leave group heartbeat", + memberIdInfoForLog(), callbackError); + } else { + log.info("Member {} completed callback to revoke task assignment. It will proceed " + + "to clear its assignment and send a leave group heartbeat", + memberIdInfoForLog()); + } + subscriptionState.unsubscribe(); + clearTaskAndPartitionAssignment(); + transitionToSendingLeaveGroup(false); + } + + /** + * This will process the assignment received if it is different from the member's current + * assignment. If a new assignment is received, this will make sure reconciliation is attempted + * on the next call of `poll`. If another reconciliation is currently in process, the first `poll` + * after that reconciliation will trigger the new reconciliation. + * + * @param activeTasks Target active tasks assignment received from the broker. + * @param standbyTasks Target standby tasks assignment received from the broker. + * @param warmupTasks Target warm-up tasks assignment received from the broker. + */ + private void processAssignmentReceived(Map<String, SortedSet<Integer>> activeTasks, + Map<String, SortedSet<Integer>> standbyTasks, + Map<String, SortedSet<Integer>> warmupTasks) { + replaceTargetAssignmentWithNewAssignment(activeTasks, standbyTasks, warmupTasks); + if (!targetAssignmentReconciled()) { + transitionTo(MemberState.RECONCILING); + } else { + log.debug("Target assignment {} received from the broker is equals to the member " + + "current assignment {}. Nothing to reconcile.", + targetAssignment, currentAssignment); + // Make sure we transition the member back to STABLE if it was RECONCILING (ex. + // member was RECONCILING unresolved assignments that were just removed by the + // broker), or JOINING (member joining received empty assignment). + if (state == MemberState.RECONCILING || state == MemberState.JOINING) { + transitionTo(MemberState.STABLE); + } + } + } + + private boolean targetAssignmentReconciled() { + return currentAssignment.equals(targetAssignment); + } + + private void replaceTargetAssignmentWithNewAssignment(Map<String, SortedSet<Integer>> activeTasks, + Map<String, SortedSet<Integer>> standbyTasks, + Map<String, SortedSet<Integer>> warmupTasks) { + targetAssignment.updateWith(activeTasks, standbyTasks, warmupTasks) + .ifPresent(updatedAssignment -> { + log.debug("Target assignment updated from {} to {}. Member will reconcile it on the next poll.", + targetAssignment, updatedAssignment); + targetAssignment = updatedAssignment; + }); + } + + @Override + public NetworkClientDelegate.PollResult poll(long currentTimeMs) { + if (state == MemberState.RECONCILING) { + maybeReconcile(); + } + return NetworkClientDelegate.PollResult.EMPTY; + } + + private void maybeReconcile() { + if (targetAssignmentReconciled()) { + log.trace("Ignoring reconciliation attempt. Target assignment is equal to the " + + "current assignment."); + return; + } + if (reconciliationInProgress) { + log.trace("Ignoring reconciliation attempt. Another reconciliation is already in progress. Assignment " + + targetAssignment + " will be handled in the next reconciliation loop."); + return; + } + + markReconciliationInProgress(); + + // ToDo: add standby and warmup tasks Review Comment: Is there a separate ticket for this, or did you forget to finish it? ########## clients/src/main/java/org/apache/kafka/clients/consumer/internals/StreamsMembershipManager.java: ########## @@ -0,0 +1,823 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.kafka.clients.consumer.internals; + +import org.apache.kafka.clients.consumer.internals.events.BackgroundEventHandler; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackCompletedEvent; +import org.apache.kafka.clients.consumer.internals.events.StreamsOnAssignmentCallbackNeededEvent; +import org.apache.kafka.clients.consumer.internals.metrics.ConsumerRebalanceMetricsManager; +import org.apache.kafka.clients.consumer.internals.metrics.RebalanceMetricsManager; +import org.apache.kafka.common.KafkaException; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.Uuid; +import org.apache.kafka.common.message.StreamsGroupHeartbeatResponseData; +import org.apache.kafka.common.metrics.Metrics; +import org.apache.kafka.common.protocol.Errors; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatRequest; +import org.apache.kafka.common.requests.StreamsGroupHeartbeatResponse; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryProvider; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryReporter; +import org.apache.kafka.common.utils.LogContext; +import org.apache.kafka.common.utils.Time; +import org.slf4j.Logger; + +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Optional; +import java.util.SortedSet; +import java.util.TreeSet; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +public class StreamsMembershipManager implements RequestManager { + + private static class LocalAssignment { + public static final long NONE_EPOCH = -1; + public static final LocalAssignment NONE = new LocalAssignment( + NONE_EPOCH, + Collections.emptyMap(), + Collections.emptyMap(), + Collections.emptyMap() + ); + + public final long localEpoch; + public final Map<String, SortedSet<Integer>> activeTasks; + public final Map<String, SortedSet<Integer>> standbyTasks; + public final Map<String, SortedSet<Integer>> warmupTasks; + + public LocalAssignment(final long localEpoch, + final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + this.localEpoch = localEpoch; + this.activeTasks = activeTasks; + this.standbyTasks = standbyTasks; + this.warmupTasks = warmupTasks; + if (localEpoch == NONE_EPOCH && + (!activeTasks.isEmpty() || !standbyTasks.isEmpty() || !warmupTasks.isEmpty())) { + throw new IllegalArgumentException("Local epoch must be set if tasks are assigned."); + } + } + + Optional<LocalAssignment> updateWith(final Map<String, SortedSet<Integer>> activeTasks, + final Map<String, SortedSet<Integer>> standbyTasks, + final Map<String, SortedSet<Integer>> warmupTasks) { + if (localEpoch != NONE_EPOCH) { + if (activeTasks.equals(this.activeTasks) && + standbyTasks.equals(this.standbyTasks) && + warmupTasks.equals(this.warmupTasks)) { + + return Optional.empty(); + } + } + + long nextLocalEpoch = localEpoch + 1; + return Optional.of(new LocalAssignment(nextLocalEpoch, activeTasks, standbyTasks, warmupTasks)); + } + + @Override + public String toString() { + return "LocalAssignment{" + + "localEpoch=" + localEpoch + + ", activeTasks=" + activeTasks + + ", standbyTasks=" + standbyTasks + + ", warmupTasks=" + warmupTasks + + '}'; + } + + @Override + public boolean equals(Object o) { + if (this == o) return true; + if (o == null || getClass() != o.getClass()) return false; + LocalAssignment that = (LocalAssignment) o; + return localEpoch == that.localEpoch && + Objects.equals(activeTasks, that.activeTasks) && + Objects.equals(standbyTasks, that.standbyTasks) && + Objects.equals(warmupTasks, that.warmupTasks); + } + + @Override + public int hashCode() { + return Objects.hash(localEpoch, activeTasks, standbyTasks, warmupTasks); + } + } + + static final Utils.TopicPartitionComparator TOPIC_PARTITION_COMPARATOR = new Utils.TopicPartitionComparator(); + + private final Logger log; + + private final StreamsAssignmentInterface streamsAssignmentInterface; + + private final SubscriptionState subscriptionState; + + private final ConsumerMetadata consumerMetadata; + + private final BackgroundEventHandler backgroundEventHandler; + + private final Map<String, Uuid> assignedTopicIdCache = new HashMap<>(); + + private MemberState state; + + private final String groupId; + + private String memberId = ""; + + private final Optional<String> groupInstanceId = Optional.empty(); + + private int memberEpoch = 0; + + private Optional<CompletableFuture<Void>> leaveGroupInProgress = Optional.empty(); + + private CompletableFuture<Void> staleMemberAssignmentRelease; + + private boolean reconciliationInProgress; + + private boolean rejoinedWhileReconciliationInProgress; + + private final Optional<ClientTelemetryReporter> clientTelemetryReporter; + + private LocalAssignment targetAssignment = LocalAssignment.NONE; + + private LocalAssignment currentAssignment = LocalAssignment.NONE; + + private final AtomicBoolean subscriptionUpdated = new AtomicBoolean(false); + + private final RebalanceMetricsManager metricsManager; + + private final Time time; + + private boolean isPollTimerExpired; + + public StreamsMembershipManager(final String groupId, + final StreamsAssignmentInterface streamsAssignmentInterface, + final ConsumerMetadata metadata, + final SubscriptionState subscriptionState, + final LogContext logContext, + final Optional<ClientTelemetryReporter> clientTelemetryReporter, + final BackgroundEventHandler backgroundEventHandler, + final Time time, + final Metrics metrics) { + log = logContext.logger(StreamsMembershipManager.class); + this.state = MemberState.UNSUBSCRIBED; + this.groupId = groupId; + this.streamsAssignmentInterface = streamsAssignmentInterface; + this.consumerMetadata = metadata; + this.subscriptionState = subscriptionState; + this.clientTelemetryReporter = clientTelemetryReporter; + this.backgroundEventHandler = backgroundEventHandler; + metricsManager = new ConsumerRebalanceMetricsManager(metrics); + this.time = time; + } + + public String groupId() { + return groupId; + } + + public String memberId() { + return memberId; + } + + public Optional<String> groupInstanceId() { + return groupInstanceId; + } + + public int memberEpoch() { + return memberEpoch; + } + + public MemberState state() { + return state; + } + + public boolean isLeavingGroup() { + MemberState state = state(); + return state == MemberState.PREPARE_LEAVING || state == MemberState.LEAVING; + } + + private boolean isNotInGroup() { + MemberState state = state(); + return state == MemberState.UNSUBSCRIBED || + state == MemberState.FENCED || + state == MemberState.FATAL || + state == MemberState.STALE; + } + + private void transitionToJoining() { + if (state == MemberState.FATAL) { + log.warn("No action taken to join the group with the updated subscription because " + + "the member is in FATAL state"); + return; + } + if (reconciliationInProgress) { + rejoinedWhileReconciliationInProgress = true; + } + resetEpoch(); + transitionTo(MemberState.JOINING); + clearPendingTaskAssignment(); + } + + private void transitionToSendingLeaveGroup(boolean dueToExpiredPollTimer) { + if (state == MemberState.FATAL) { + log.warn("Member {} with epoch {} won't send leave group request because it is in " + + "FATAL state", memberIdInfoForLog(), memberEpoch); + return; + } + if (state == MemberState.UNSUBSCRIBED) { + log.warn("Member {} won't send leave group request because it is already out of the group.", + memberIdInfoForLog()); + return; + } + + if (dueToExpiredPollTimer) { + isPollTimerExpired = true; + // Briefly transition through prepare leaving. The member does not have to release + // any assignment before sending the leave group given that is stale. It will invoke + // onTaskAssignment with empty assignment after sending the leave group on the STALE state. + transitionTo(MemberState.PREPARE_LEAVING); + } + finalizeLeaving(); + transitionTo(MemberState.LEAVING); + } + + private void finalizeLeaving() { + updateMemberEpoch(StreamsGroupHeartbeatRequest.LEAVE_GROUP_MEMBER_EPOCH); + clearPendingTaskAssignment(); + } + + private void transitionToStale() { + transitionTo(MemberState.STALE); + + CompletableFuture<Void> onAllTasksRevokedDone = invokeRevokingAllTasksCallback(); + staleMemberAssignmentRelease = onAllTasksRevokedDone.whenComplete((result, error) -> { + if (error != null) { + log.error("Task revocation callback invocation failed " + + "after member left group due to expired poll timer.", error); + } + clearTaskAndPartitionAssignment(); + log.debug("Member {} sent leave group heartbeat and released its assignment. It will remain " + + "in {} state until the poll timer is reset, and it will then rejoin the group", + memberIdInfoForLog(), MemberState.STALE); + }); + } + + public void transitionToFatal() { + MemberState previousState = state; + transitionTo(MemberState.FATAL); + log.error("Member {} with epoch {} transitioned to fatal state", memberIdInfoForLog(), memberEpoch); + + if (previousState == MemberState.UNSUBSCRIBED) { + log.debug("Member {} with epoch {} got fatal error from the broker but it already " + + "left the group, so onTaskAssignment callback won't be triggered.", memberIdInfoForLog(), memberEpoch); + return; + } + + if (previousState == MemberState.LEAVING || previousState == MemberState.PREPARE_LEAVING) { + log.info("Member {} with epoch {} was leaving the group with state {} when it got a " + + "fatal error from the broker. It will discard the ongoing leave and remain in " + + "fatal state.", memberIdInfoForLog(), memberEpoch, previousState); + maybeCompleteLeaveInProgress(); + return; + } + + CompletableFuture<Void> callbackResult = invokeRevokingAllTasksCallback(); + callbackResult.whenComplete((result, error) -> { + if (error != null) { + log.error("onTaskAssignment callback invocation failed while releasing assignment" + + "after member failed with fatal error.", error); + } + clearTaskAndPartitionAssignment(); + }); + } + + public void transitionToUnsubscribeIfLeaving() { + if (state == MemberState.LEAVING) { + log.warn("Heartbeat to leave group cannot be sent (most probably due to coordinator " + + "not known/available). Member {} with epoch {} will transition to {}.", + memberIdInfoForLog(), memberEpoch, MemberState.UNSUBSCRIBED); + transitionTo(MemberState.UNSUBSCRIBED); + maybeCompleteLeaveInProgress(); + } + } + + private void transitionTo(MemberState nextState) { + if (!state.equals(nextState) && !nextState.getPreviousValidStates().contains(state)) { + throw new IllegalStateException(String.format("Invalid state transition from %s to %s", + state, nextState)); + } + + if (isCompletingRebalance(state, nextState)) { + metricsManager.recordRebalanceEnded(time.milliseconds()); + } + if (isStartingRebalance(state, nextState)) { + metricsManager.recordRebalanceStarted(time.milliseconds()); + } + + log.info("Member {} with epoch {} transitioned from {} to {}.", memberIdInfoForLog(), memberEpoch, state, nextState); + this.state = nextState; + } + + private static boolean isCompletingRebalance(MemberState currentState, MemberState nextState) { + return currentState == MemberState.RECONCILING && + (nextState == MemberState.STABLE || nextState == MemberState.ACKNOWLEDGING); + } + + private static boolean isStartingRebalance(MemberState currentState, MemberState nextState) { + return currentState != MemberState.RECONCILING && nextState == MemberState.RECONCILING; + } + + private void resetEpoch() { + updateMemberEpoch(StreamsGroupHeartbeatRequest.JOIN_GROUP_MEMBER_EPOCH); + } + + private void updateMemberEpoch(int newEpoch) { + memberEpoch = newEpoch; + } + + private void clearPendingTaskAssignment() { + currentAssignment = LocalAssignment.NONE; + } + + private void clearTaskAndPartitionAssignment() { + subscriptionState.assignFromSubscribed(Collections.emptySet()); + currentAssignment = LocalAssignment.NONE; + targetAssignment = LocalAssignment.NONE; + } + + public boolean shouldSkipHeartbeat() { + return isNotInGroup(); + } + + public boolean shouldHeartbeatNow() { + MemberState state = state(); + return state == MemberState.ACKNOWLEDGING || state == MemberState.LEAVING || state == MemberState.JOINING; + } + + public void onSubscriptionUpdated() { + subscriptionUpdated.compareAndSet(false, true); + } + + public void onConsumerPoll() { + if (subscriptionUpdated.compareAndSet(true, false) && state == MemberState.UNSUBSCRIBED) { + transitionToJoining(); + } + } + + public void onHeartbeatRequestGenerated() { + MemberState state = state(); + if (state == MemberState.ACKNOWLEDGING) { + if (targetAssignmentReconciled()) { + transitionTo(MemberState.STABLE); + } else { + log.debug("Member {} with epoch {} transitioned to {} after a heartbeat was sent " + + "to ack a previous reconciliation. New assignments are ready to " + + "be reconciled.", memberIdInfoForLog(), memberEpoch, MemberState.RECONCILING); + transitionTo(MemberState.RECONCILING); + } + } else if (state == MemberState.LEAVING) { + if (isPollTimerExpired) { + log.debug("Member {} with epoch {} generated the heartbeat to leave due to expired poll timer. It will " + + "remain stale (no heartbeat) until it rejoins the group on the next consumer " + + "poll.", memberIdInfoForLog(), memberEpoch); + transitionToStale(); + } else { + log.debug("Member {} with epoch {} generated the heartbeat to leave the group.", memberIdInfoForLog(), memberEpoch); + transitionTo(MemberState.UNSUBSCRIBED); + } + } + } + + public void onHeartbeatSuccess(StreamsGroupHeartbeatResponse response) { + StreamsGroupHeartbeatResponseData responseData = response.data(); + throwIfUnexpectedError(responseData); + if (state == MemberState.LEAVING) { + log.debug("Ignoring heartbeat response received from broker. Member {} with epoch {} is " + + "already leaving the group.", memberId, memberEpoch); + return; + } + if (state == MemberState.UNSUBSCRIBED && maybeCompleteLeaveInProgress()) { + log.debug("Member {} with epoch {} received a successful response to the heartbeat " + + "to leave the group and completed the leave operation. ", memberId, memberEpoch); + return; + } + if (isNotInGroup()) { + log.debug("Ignoring heartbeat response received from broker. Member {} is in {} state" + + " so it's not a member of the group. ", memberId, state); + return; + } + + // Update the group member id label in the client telemetry reporter if the member id has + // changed. Initially the member id is empty, and it is updated when the member joins the + // group. This is done here to avoid updating the label on every heartbeat response. Also + // check if the member id is null, as the schema defines it as nullable. + if (responseData.memberId() != null && !responseData.memberId().equals(memberId)) { + clientTelemetryReporter.ifPresent(reporter -> reporter.updateMetricsLabels( + Collections.singletonMap(ClientTelemetryProvider.GROUP_MEMBER_ID, responseData.memberId()))); + } + + memberId = responseData.memberId(); + updateMemberEpoch(responseData.memberEpoch()); + + final List<StreamsGroupHeartbeatResponseData.TaskIds> activeTasks = responseData.activeTasks(); + final List<StreamsGroupHeartbeatResponseData.TaskIds> standbyTasks = responseData.standbyTasks(); + final List<StreamsGroupHeartbeatResponseData.TaskIds> warmupTasks = responseData.warmupTasks(); + + if (activeTasks != null && standbyTasks != null && warmupTasks != null) { + + if (!state.canHandleNewAssignment()) { + log.debug("Ignoring new assignment: active tasks {}, standby tasks {}, and warm-up tasks {} received " + + "from server because member is in {} state.", + activeTasks, standbyTasks, warmupTasks, state); + return; + } + + processAssignmentReceived( + toTasksAssignment(activeTasks), + toTasksAssignment(standbyTasks), + toTasksAssignment(warmupTasks) + ); + } else { + if (responseData.activeTasks() != null || + responseData.standbyTasks() != null || + responseData.warmupTasks() != null) { + + throw new IllegalStateException("Invalid response data, task collections must be all null or all non-null: " + + responseData); + } + } + } + + public void onHeartbeatFailure(boolean retriable) { + if (!retriable) { + metricsManager.maybeRecordRebalanceFailed(); + } + // The leave group request is sent out once (not retried), so we should complete the leave + // operation once the request completes, regardless of the response. + if (state == MemberState.UNSUBSCRIBED && maybeCompleteLeaveInProgress()) { + log.warn("Member {} with epoch {} received a failed response to the heartbeat to " + + "leave the group and completed the leave operation. ", memberIdInfoForLog(), memberEpoch); + } + } + + public void onPollTimerExpired() { + transitionToSendingLeaveGroup(true); + } + + public void onFenced() { + if (state == MemberState.PREPARE_LEAVING) { + log.info("Member {} with epoch {} got fenced but it is already preparing to leave " + + "the group, so it will stop sending heartbeat and won't attempt to send the " + + "leave request or rejoin.", memberIdInfoForLog(), memberEpoch); + finalizeLeaving(); + transitionTo(MemberState.UNSUBSCRIBED); + maybeCompleteLeaveInProgress(); + return; + } + + if (state == MemberState.LEAVING) { + log.debug("Member {} with epoch {} got fenced before sending leave group heartbeat. " + + "It will not send the leave request and won't attempt to rejoin.", memberIdInfoForLog(), memberEpoch); + transitionTo(MemberState.UNSUBSCRIBED); + maybeCompleteLeaveInProgress(); + return; + } + if (state == MemberState.UNSUBSCRIBED) { + log.debug("Member {} with epoch {} got fenced but it already left the group, so it " + + "won't attempt to rejoin.", memberIdInfoForLog(), memberEpoch); + return; + } + transitionTo(MemberState.FENCED); + resetEpoch(); + log.debug("Member {} with epoch {} transitioned to {} state. It will release its " + + "assignment and rejoin the group.", memberIdInfoForLog(), memberEpoch, MemberState.FENCED); + + CompletableFuture<Void> callbackResult = invokeRevokingAllTasksCallback(); Review Comment: Is there no difference between revoking all tasksa and losing all tasks? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. 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