tledkov commented on code in PR #13247: URL: https://github.com/apache/kafka/pull/13247#discussion_r1347288301
########## tools/src/main/java/org/apache/kafka/tools/reassign/ReassignPartitionsCommand.java: ########## @@ -0,0 +1,1513 @@ +/* + * 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.tools.reassign; + +import com.fasterxml.jackson.core.JsonParseException; +import com.fasterxml.jackson.core.JsonProcessingException; +import com.fasterxml.jackson.databind.JsonMappingException; +import joptsimple.OptionSpec; +import org.apache.kafka.admin.AdminUtils; +import org.apache.kafka.admin.BrokerMetadata; +import org.apache.kafka.clients.admin.Admin; +import org.apache.kafka.clients.admin.AdminClientConfig; +import org.apache.kafka.clients.admin.AlterConfigOp; +import org.apache.kafka.clients.admin.ConfigEntry; +import org.apache.kafka.clients.admin.DescribeReplicaLogDirsResult; +import org.apache.kafka.clients.admin.NewPartitionReassignment; +import org.apache.kafka.clients.admin.PartitionReassignment; +import org.apache.kafka.clients.admin.TopicDescription; +import org.apache.kafka.common.KafkaFuture; +import org.apache.kafka.common.Node; +import org.apache.kafka.common.TopicPartition; +import org.apache.kafka.common.TopicPartitionReplica; +import org.apache.kafka.common.config.ConfigResource; +import org.apache.kafka.common.errors.ReplicaNotAvailableException; +import org.apache.kafka.common.errors.UnknownTopicOrPartitionException; +import org.apache.kafka.common.utils.Exit; +import org.apache.kafka.common.utils.Time; +import org.apache.kafka.common.utils.Utils; +import org.apache.kafka.server.common.AdminCommandFailedException; +import org.apache.kafka.server.common.AdminOperationException; +import org.apache.kafka.server.util.CommandLineUtils; +import org.apache.kafka.server.util.Json; +import org.apache.kafka.server.util.json.DecodeJson; +import org.apache.kafka.server.util.json.JsonObject; +import org.apache.kafka.server.util.json.JsonValue; +import org.apache.kafka.tools.TerseException; +import org.apache.kafka.tools.ToolsUtils; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collection; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Iterator; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Optional; +import java.util.Properties; +import java.util.Set; +import java.util.TreeSet; +import java.util.concurrent.ExecutionException; +import java.util.stream.Collectors; + +@SuppressWarnings("ClassDataAbstractionCoupling") +public class ReassignPartitionsCommand { + private static final String ANY_LOG_DIR = "any"; + + static final String HELP_TEXT = "This tool helps to move topic partitions between replicas."; + + private static final DecodeJson.DecodeInteger INT = new DecodeJson.DecodeInteger(); + + private static final DecodeJson.DecodeString STRING = new DecodeJson.DecodeString(); + + private static final DecodeJson<List<Integer>> INT_LIST = DecodeJson.decodeList(INT); + + private static final DecodeJson<List<String>> STRING_LIST = DecodeJson.decodeList(STRING); + + /** + * The earliest version of the partition reassignment JSON. We will default to this + * version if no other version number is given. + */ + static final int EARLIEST_VERSION = 1; + + /** + * The earliest version of the JSON for each partition reassignment topic. We will + * default to this version if no other version number is given. + */ + static final int EARLIEST_TOPICS_JSON_VERSION = 1; + + // Throttles that are set at the level of an individual broker. + //DynamicConfig.Broker.LeaderReplicationThrottledRateProp + static final String BROKER_LEVEL_LEADER_THROTTLE = "leader.replication.throttled.rate"; + //DynamicConfig.Broker.FollowerReplicationThrottledRateProp + static final String BROKER_LEVEL_FOLLOWER_THROTTLE = "follower.replication.throttled.rate"; + //DynamicConfig.Broker.ReplicaAlterLogDirsIoMaxBytesPerSecondProp + static final String BROKER_LEVEL_LOG_DIR_THROTTLE = "replica.alter.log.dirs.io.max.bytes.per.second"; + static final List<String> BROKER_LEVEL_THROTTLES = Arrays.asList( + BROKER_LEVEL_LEADER_THROTTLE, + BROKER_LEVEL_FOLLOWER_THROTTLE, + BROKER_LEVEL_LOG_DIR_THROTTLE + ); + + // Throttles that are set at the level of an individual topic. + //LogConfig.LEADER_REPLICATION_THROTTLED_REPLICAS_CONFIG + static final String TOPIC_LEVEL_LEADER_THROTTLE = "leader.replication.throttled.replicas"; + //LogConfig.FOLLOWER_REPLICATION_THROTTLED_REPLICAS_CONFIG + static final String TOPIC_LEVEL_FOLLOWER_THROTTLE = "follower.replication.throttled.replicas"; + private static final List<String> TOPIC_LEVEL_THROTTLES = Arrays.asList( + TOPIC_LEVEL_LEADER_THROTTLE, + TOPIC_LEVEL_FOLLOWER_THROTTLE + ); + + private static final String CANNOT_EXECUTE_BECAUSE_OF_EXISTING_MESSAGE = "Cannot execute because " + + "there is an existing partition assignment. Use --additional to override this and " + + "create a new partition assignment in addition to the existing one. The --additional " + + "flag can also be used to change the throttle by resubmitting the current reassignment."; + + private static final String YOU_MUST_RUN_VERIFY_PERIODICALLY_MESSAGE = "Warning: You must run " + + "--verify periodically, until the reassignment completes, to ensure the throttle " + + "is removed."; + + public static void main(String[] args) { + ReassignPartitionsCommandOptions opts = validateAndParseArgs(args); + boolean failed = true; + Admin adminClient = null; + + try { + Properties props = opts.options.has(opts.commandConfigOpt) + ? Utils.loadProps(opts.options.valueOf(opts.commandConfigOpt)) + : new Properties(); + props.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, opts.options.valueOf(opts.bootstrapServerOpt)); + props.putIfAbsent(AdminClientConfig.CLIENT_ID_CONFIG, "reassign-partitions-tool"); + adminClient = Admin.create(props); + handleAction(adminClient, opts); + failed = false; + } catch (TerseException e) { + System.out.println(e.getMessage()); + } catch (Throwable e) { + System.out.println("Error: " + e.getMessage()); + System.out.println(Utils.stackTrace(e)); + } finally { + // It's good to do this after printing any error stack trace. + if (adminClient != null) { + adminClient.close(); + } + } + // If the command failed, exit with a non-zero exit code. + if (failed) { + Exit.exit(1); + } + } + + private static void handleAction(Admin adminClient, ReassignPartitionsCommandOptions opts) throws IOException, ExecutionException, InterruptedException, TerseException { + if (opts.options.has(opts.verifyOpt)) { + verifyAssignment(adminClient, + Utils.readFileAsString(opts.options.valueOf(opts.reassignmentJsonFileOpt)), + opts.options.has(opts.preserveThrottlesOpt)); + } else if (opts.options.has(opts.generateOpt)) { + generateAssignment(adminClient, + Utils.readFileAsString(opts.options.valueOf(opts.topicsToMoveJsonFileOpt)), + opts.options.valueOf(opts.brokerListOpt), + !opts.options.has(opts.disableRackAware)); + } else if (opts.options.has(opts.executeOpt)) { + executeAssignment(adminClient, + opts.options.has(opts.additionalOpt), + Utils.readFileAsString(opts.options.valueOf(opts.reassignmentJsonFileOpt)), + opts.options.valueOf(opts.interBrokerThrottleOpt), + opts.options.valueOf(opts.replicaAlterLogDirsThrottleOpt), + opts.options.valueOf(opts.timeoutOpt), + Time.SYSTEM); + } else if (opts.options.has(opts.cancelOpt)) { + cancelAssignment(adminClient, + Utils.readFileAsString(opts.options.valueOf(opts.reassignmentJsonFileOpt)), + opts.options.has(opts.preserveThrottlesOpt), + opts.options.valueOf(opts.timeoutOpt), + Time.SYSTEM); + } else if (opts.options.has(opts.listOpt)) { + listReassignments(adminClient); + } else { + throw new RuntimeException("Unsupported action."); + } + } + + /** + * The entry point for the --verify command. + * + * @param adminClient The AdminClient to use. + * @param jsonString The JSON string to use for the topics and partitions to verify. + * @param preserveThrottles True if we should avoid changing topic or broker throttles. + * + * @return A result that is useful for testing. + */ + static VerifyAssignmentResult verifyAssignment(Admin adminClient, + String jsonString, + Boolean preserveThrottles + ) throws ExecutionException, InterruptedException, JsonProcessingException { + Tuple2<List<Tuple2<TopicPartition, List<Integer>>>, Map<TopicPartitionReplica, String>> t0 = parsePartitionReassignmentData(jsonString); + + List<Tuple2<TopicPartition, List<Integer>>> targetParts = t0.v1; + Map<TopicPartitionReplica, String> targetLogDirs = t0.v2; + + Tuple2<Map<TopicPartition, PartitionReassignmentState>, Boolean> t1 = verifyPartitionAssignments(adminClient, targetParts); + + Map<TopicPartition, PartitionReassignmentState> partStates = t1.v1; + Boolean partsOngoing = t1.v2; + + Tuple2<Map<TopicPartitionReplica, LogDirMoveState>, Boolean> t2 = verifyReplicaMoves(adminClient, targetLogDirs); + + Map<TopicPartitionReplica, LogDirMoveState> moveStates = t2.v1; + Boolean movesOngoing = t2.v2; + + if (!partsOngoing && !movesOngoing && !preserveThrottles) { + // If the partition assignments and replica assignments are done, clear any throttles + // that were set. We have to clear all throttles, because we don't have enough + // information to know all of the source brokers that might have been involved in the + // previous reassignments. + clearAllThrottles(adminClient, targetParts); + } + + return new VerifyAssignmentResult(partStates, partsOngoing, moveStates, movesOngoing); + } + + /** + * Verify the partition reassignments specified by the user. + * + * @param adminClient The AdminClient to use. + * @param targets The partition reassignments specified by the user. + * + * @return A tuple of the partition reassignment states, and a + * boolean which is true if there are no ongoing + * reassignments (including reassignments not described + * in the JSON file.) + */ + private static Tuple2<Map<TopicPartition, PartitionReassignmentState>, Boolean> verifyPartitionAssignments(Admin adminClient, + List<Tuple2<TopicPartition, List<Integer>>> targets + ) throws ExecutionException, InterruptedException { + Tuple2<Map<TopicPartition, PartitionReassignmentState>, Boolean> t0 = findPartitionReassignmentStates(adminClient, targets); + System.out.println(partitionReassignmentStatesToString(t0.v1)); + return t0; + } + + static int compareTopicPartitions(TopicPartition a, TopicPartition b) { + int topicOrder = Objects.compare(a.topic(), b.topic(), String::compareTo); + return topicOrder == 0 ? Integer.compare(a.partition(), b.partition()) : topicOrder; + } + + static int compareTopicPartitionReplicas(TopicPartitionReplica a, TopicPartitionReplica b) { + int brokerOrder = Integer.compare(a.brokerId(), b.brokerId()); + + if (brokerOrder != 0) + return brokerOrder; + + int topicOrder = Objects.compare(a.topic(), b.topic(), String::compareTo); + return topicOrder == 0 ? Integer.compare(a.partition(), b.partition()) : topicOrder; + } + + /** + * Convert partition reassignment states to a human-readable string. + * + * @param states A map from topic partitions to states. + * @return A string summarizing the partition reassignment states. + */ + static String partitionReassignmentStatesToString(Map<TopicPartition, PartitionReassignmentState> states) { + List<String> bld = new ArrayList<>(); + bld.add("Status of partition reassignment:"); + states.keySet().stream().sorted(ReassignPartitionsCommand::compareTopicPartitions).forEach(topicPartition -> { + PartitionReassignmentState state = states.get(topicPartition); + if (state.done) { + if (state.currentReplicas.equals(state.targetReplicas)) { + bld.add(String.format("Reassignment of partition %s is completed.", topicPartition)); + } else { + String currentReplicaStr = state.currentReplicas.stream().map(String::valueOf).collect(Collectors.joining(",")); + String targetReplicaStr = state.targetReplicas.stream().map(String::valueOf).collect(Collectors.joining(",")); + + bld.add("There is no active reassignment of partition " + topicPartition + ", " + + "but replica set is " + currentReplicaStr + " rather than " + + targetReplicaStr + "."); + } + } else { + bld.add(String.format("Reassignment of partition %s is still in progress.", topicPartition)); + } + }); + return bld.stream().collect(Collectors.joining(System.lineSeparator())); + } + + /** + * Find the state of the specified partition reassignments. + * + * @param adminClient The Admin client to use. + * @param targetReassignments The reassignments we want to learn about. + * + * @return A tuple containing the reassignment states for each topic + * partition, plus whether there are any ongoing reassignments. + */ + static Tuple2<Map<TopicPartition, PartitionReassignmentState>, Boolean> findPartitionReassignmentStates(Admin adminClient, + List<Tuple2<TopicPartition, + List<Integer>>> targetReassignments + ) throws ExecutionException, InterruptedException { + Map<TopicPartition, PartitionReassignment> currentReassignments = adminClient. + listPartitionReassignments().reassignments().get(); + + List<Tuple2<TopicPartition, List<Integer>>> foundReassignments = new ArrayList<>(); + List<Tuple2<TopicPartition, List<Integer>>> notFoundReassignments = new ArrayList<>(); + + targetReassignments.forEach(reassignment -> { + if (currentReassignments.containsKey(reassignment.v1)) + foundReassignments.add(reassignment); + else + notFoundReassignments.add(reassignment); + }); + + List<Tuple2<TopicPartition, PartitionReassignmentState>> foundResults = foundReassignments.stream().map(e -> { + TopicPartition part = e.v1; + List<Integer> targetReplicas = e.v2; + return new Tuple2<>(part, + new PartitionReassignmentState( + currentReassignments.get(part).replicas(), + targetReplicas, + false)); + }).collect(Collectors.toList()); + + Set<String> topicNamesToLookUp = notFoundReassignments.stream() + .map(e -> e.v1) + .filter(part -> !currentReassignments.containsKey(part)) + .map(TopicPartition::topic) + .collect(Collectors.toSet()); + + Map<String, KafkaFuture<TopicDescription>> topicDescriptions = adminClient. + describeTopics(topicNamesToLookUp).topicNameValues(); + + List<Tuple2<TopicPartition, PartitionReassignmentState>> notFoundResults = new ArrayList<>(); + for (Tuple2<TopicPartition, List<Integer>> e : notFoundReassignments) { + TopicPartition part = e.v1; + List<Integer> targetReplicas = e.v2; + + if (currentReassignments.containsKey(part)) { + PartitionReassignment reassignment = currentReassignments.get(part); + notFoundResults.add(new Tuple2<>(part, new PartitionReassignmentState( + reassignment.replicas(), + targetReplicas, + false))); + } else { + notFoundResults.add(new Tuple2<>(part, topicDescriptionFutureToState(part.partition(), + topicDescriptions.get(part.topic()), targetReplicas))); + } + } + + Map<TopicPartition, PartitionReassignmentState> allResults = new HashMap<>(); + foundResults.forEach(e -> allResults.put(e.v1, e.v2)); + notFoundResults.forEach(e -> allResults.put(e.v1, e.v2)); + + return new Tuple2<>(allResults, currentReassignments.size() > 0); + } + + private static PartitionReassignmentState topicDescriptionFutureToState(int partition, + KafkaFuture<TopicDescription> future, + List<Integer> targetReplicas + ) throws InterruptedException, ExecutionException { + try { + TopicDescription topicDescription = future.get(); + if (topicDescription.partitions().size() < partition) { + throw new ExecutionException("Too few partitions found", new UnknownTopicOrPartitionException()); + } + return new PartitionReassignmentState( + topicDescription.partitions().get(partition).replicas().stream().map(Node::id).collect(Collectors.toList()), + targetReplicas, + true); + } catch (ExecutionException t) { + if (t.getCause() instanceof UnknownTopicOrPartitionException) + return new PartitionReassignmentState(Collections.emptyList(), targetReplicas, true); + + throw t; + } + } + + /** + * Verify the replica reassignments specified by the user. + * + * @param adminClient The AdminClient to use. + * @param targetReassignments The replica reassignments specified by the user. + * + * @return A tuple of the replica states, and a boolean which is true + * if there are any ongoing replica moves. + * + * Note: Unlike in verifyPartitionAssignments, we will + * return false here even if there are unrelated ongoing + * reassignments. (We don't have an efficient API that + * returns all ongoing replica reassignments.) + */ + private static Tuple2<Map<TopicPartitionReplica, LogDirMoveState>, Boolean> verifyReplicaMoves(Admin adminClient, + Map<TopicPartitionReplica, String> targetReassignments + ) throws ExecutionException, InterruptedException { + Map<TopicPartitionReplica, LogDirMoveState> moveStates = findLogDirMoveStates(adminClient, targetReassignments); + System.out.println(replicaMoveStatesToString(moveStates)); + return new Tuple2<>(moveStates, !moveStates.values().stream().allMatch(LogDirMoveState::done)); + } + + /** + * Find the state of the specified partition reassignments. + * + * @param adminClient The AdminClient to use. + * @param targetMoves The movements we want to learn about. The map is keyed + * by TopicPartitionReplica, and its values are target log + * directories. + * + * @return The states for each replica movement. + */ + static Map<TopicPartitionReplica, LogDirMoveState> findLogDirMoveStates(Admin adminClient, + Map<TopicPartitionReplica, String> targetMoves + ) throws ExecutionException, InterruptedException { + Map<TopicPartitionReplica, DescribeReplicaLogDirsResult.ReplicaLogDirInfo> replicaLogDirInfos = adminClient + .describeReplicaLogDirs(targetMoves.keySet()).all().get(); + + return targetMoves.entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, e -> { + TopicPartitionReplica replica = e.getKey(); + String targetLogDir = e.getValue(); + + if (!replicaLogDirInfos.containsKey(replica)) + return new MissingReplicaMoveState(targetLogDir); + + DescribeReplicaLogDirsResult.ReplicaLogDirInfo info = replicaLogDirInfos.get(replica); + + if (info.getCurrentReplicaLogDir() == null) + return new MissingLogDirMoveState(targetLogDir); + + if (info.getFutureReplicaLogDir() == null) { + if (info.getCurrentReplicaLogDir().equals(targetLogDir)) + return new CompletedMoveState(targetLogDir); + + return new CancelledMoveState(info.getCurrentReplicaLogDir(), targetLogDir); + } + + return new ActiveMoveState(info.getCurrentReplicaLogDir(), targetLogDir, info.getFutureReplicaLogDir()); + })); + } + + /** + * Convert replica move states to a human-readable string. + * + * @param states A map from topic partition replicas to states. + * @return A tuple of a summary string, and a boolean describing + * whether there are any active replica moves. + */ + static String replicaMoveStatesToString(Map<TopicPartitionReplica, LogDirMoveState> states) { + List<String> bld = new ArrayList<>(); + states.keySet().stream().sorted(ReassignPartitionsCommand::compareTopicPartitionReplicas).forEach(replica -> { + LogDirMoveState state = states.get(replica); + if (state instanceof MissingLogDirMoveState) { + bld.add("Partition " + replica.topic() + "-" + replica.partition() + " is not found " + + "in any live log dir on broker " + replica.brokerId() + ". There is likely an " + + "offline log directory on the broker."); + } else if (state instanceof MissingReplicaMoveState) { + bld.add("Partition " + replica.topic() + "-" + replica.partition() + " cannot be found " + + "in any live log directory on broker " + replica.brokerId() + "."); + } else if (state instanceof ActiveMoveState) { + String targetLogDir = ((ActiveMoveState) state).targetLogDir; + String futureLogDir = ((ActiveMoveState) state).futureLogDir; + if (targetLogDir.equals(futureLogDir)) { + bld.add("Reassignment of replica " + replica + " is still in progress."); + } else { + bld.add("Partition " + replica.topic() + "-" + replica.partition() + " on broker " + + replica.brokerId() + " is being moved to log dir " + futureLogDir + " " + + "instead of " + targetLogDir + "."); + } + } else if (state instanceof CancelledMoveState) { + String targetLogDir = ((CancelledMoveState) state).targetLogDir; + String currentLogDir = ((CancelledMoveState) state).currentLogDir; + bld.add("Partition " + replica.topic() + "-" + replica.partition() + " on broker " + + replica.brokerId() + " is not being moved from log dir " + currentLogDir + " to " + + targetLogDir + "."); + } else if (state instanceof CompletedMoveState) { + bld.add("Reassignment of replica " + replica + " completed successfully."); + } + }); + + return bld.stream().collect(Collectors.joining(System.lineSeparator())); + } + + /** + * Clear all topic-level and broker-level throttles. + * + * @param adminClient The AdminClient to use. + * @param targetParts The target partitions loaded from the JSON file. + */ + private static void clearAllThrottles(Admin adminClient, + List<Tuple2<TopicPartition, List<Integer>>> targetParts + ) throws ExecutionException, InterruptedException { + Set<Integer> activeBrokers = adminClient.describeCluster().nodes().get().stream().map(Node::id).collect(Collectors.toSet()); + Set<Integer> brokers = new HashSet<>(activeBrokers); + targetParts.forEach(t -> brokers.addAll(t.v2)); + + System.out.printf("Clearing broker-level throttles on broker%s %s%n", + brokers.size() == 1 ? "" : "s", Utils.join(brokers, ",")); + clearBrokerLevelThrottles(adminClient, brokers); + + Set<String> topics = targetParts.stream().map(t -> t.v1.topic()).collect(Collectors.toSet()); + System.out.printf("Clearing topic-level throttles on topic%s %s%n", + topics.size() == 1 ? "" : "s", Utils.join(topics, ",")); + clearTopicLevelThrottles(adminClient, topics); + } + + /** + * Clear all throttles which have been set at the broker level. + * + * @param adminClient The AdminClient to use. + * @param brokers The brokers to clear the throttles for. + */ + private static void clearBrokerLevelThrottles(Admin adminClient, Set<Integer> brokers) throws ExecutionException, InterruptedException { + Map<ConfigResource, Collection<AlterConfigOp>> configOps = new HashMap<>(); + brokers.forEach(brokerId -> configOps.put( + new ConfigResource(ConfigResource.Type.BROKER, brokerId.toString()), + BROKER_LEVEL_THROTTLES.stream().map(throttle -> new AlterConfigOp( + new ConfigEntry(throttle, null), AlterConfigOp.OpType.DELETE)).collect(Collectors.toList()) + )); + adminClient.incrementalAlterConfigs(configOps).all().get(); + } + + /** + * Clear the reassignment throttles for the specified topics. + * + * @param adminClient The AdminClient to use. + * @param topics The topics to clear the throttles for. + */ + private static void clearTopicLevelThrottles(Admin adminClient, Set<String> topics) throws ExecutionException, InterruptedException { + Map<ConfigResource, Collection<AlterConfigOp>> configOps = topics.stream().collect(Collectors.toMap( + topicName -> new ConfigResource(ConfigResource.Type.TOPIC, topicName), + topicName -> TOPIC_LEVEL_THROTTLES.stream().map(throttle -> new AlterConfigOp(new ConfigEntry(throttle, null), + AlterConfigOp.OpType.DELETE)).collect(Collectors.toList()) + )); + + adminClient.incrementalAlterConfigs(configOps).all().get(); + } + + /** + * The entry point for the --generate command. + * + * @param adminClient The AdminClient to use. + * @param reassignmentJson The JSON string to use for the topics to reassign. + * @param brokerListString The comma-separated string of broker IDs to use. + * @param enableRackAwareness True if rack-awareness should be enabled. + * + * @return A tuple containing the proposed assignment and the + * current assignment. + */ + static Tuple2<Map<TopicPartition, List<Integer>>, Map<TopicPartition, List<Integer>>> generateAssignment(Admin adminClient, + String reassignmentJson, + String brokerListString, + Boolean enableRackAwareness + ) throws ExecutionException, InterruptedException, JsonProcessingException { + Tuple2<List<Integer>, List<String>> t0 = parseGenerateAssignmentArgs(reassignmentJson, brokerListString); + + List<Integer> brokersToReassign = t0.v1; + List<String> topicsToReassign = t0.v2; + + Map<TopicPartition, List<Integer>> currentAssignments = getReplicaAssignmentForTopics(adminClient, topicsToReassign); + List<BrokerMetadata> brokerMetadatas = getBrokerMetadata(adminClient, brokersToReassign, enableRackAwareness); + Map<TopicPartition, List<Integer>> proposedAssignments = calculateAssignment(currentAssignments, brokerMetadatas); + System.out.printf("Current partition replica assignment%n%s%n%n", + formatAsReassignmentJson(currentAssignments, Collections.emptyMap())); + System.out.printf("Proposed partition reassignment configuration%n%s%n", + formatAsReassignmentJson(proposedAssignments, Collections.emptyMap())); + return new Tuple2<>(proposedAssignments, currentAssignments); + } + + /** + * Calculate the new partition assignments to suggest in --generate. + * + * @param currentAssignment The current partition assignments. + * @param brokerMetadatas The rack information for each broker. + * + * @return A map from partitions to the proposed assignments for each. + */ + private static Map<TopicPartition, List<Integer>> calculateAssignment(Map<TopicPartition, List<Integer>> currentAssignment, + List<BrokerMetadata> brokerMetadatas) { + Map<String, List<Map.Entry<TopicPartition, List<Integer>>>> groupedByTopic = new HashMap<>(); + for (Map.Entry<TopicPartition, List<Integer>> e : currentAssignment.entrySet()) + groupedByTopic.computeIfAbsent(e.getKey().topic(), k -> new ArrayList<>()).add(e); + Map<TopicPartition, List<Integer>> proposedAssignments = new HashMap<>(); + groupedByTopic.forEach((topic, assignment) -> { + List<Integer> replicas = assignment.get(0).getValue(); + Map<Integer, List<Integer>> assignedReplicas = AdminUtils. + assignReplicasToBrokers(brokerMetadatas, assignment.size(), replicas.size()); + assignedReplicas.forEach((partition, replicas0) -> + proposedAssignments.put(new TopicPartition(topic, partition), replicas0)); + }); + return proposedAssignments; + } + + private static Map<String, TopicDescription> describeTopics(Admin adminClient, + Set<String> topics) throws ExecutionException, InterruptedException { + Map<String, KafkaFuture<TopicDescription>> futures = adminClient.describeTopics(topics).topicNameValues(); + Map<String, TopicDescription> res = new HashMap<>(); + for (Map.Entry<String, KafkaFuture<TopicDescription>> e : futures.entrySet()) { + String topicName = e.getKey(); + KafkaFuture<TopicDescription> topicDescriptionFuture = e.getValue(); + try { + res.put(topicName, topicDescriptionFuture.get()); + } catch (ExecutionException t) { + if (t.getCause() instanceof UnknownTopicOrPartitionException) + throw new ExecutionException( + new UnknownTopicOrPartitionException("Topic " + topicName + " not found.")); + throw t; + } + } + return res; + } + + /** + * Get the current replica assignments for some topics. + * + * @param adminClient The AdminClient to use. + * @param topics The topics to get information about. + * @return A map from partitions to broker assignments. + * If any topic can't be found, an exception will be thrown. + */ + static Map<TopicPartition, List<Integer>> getReplicaAssignmentForTopics(Admin adminClient, + List<String> topics + ) throws ExecutionException, InterruptedException { + Map<TopicPartition, List<Integer>> res = new HashMap<>(); + describeTopics(adminClient, new HashSet<>(topics)).forEach((topicName, topicDescription) -> + topicDescription.partitions().forEach(info -> res.put( + new TopicPartition(topicName, info.partition()), + info.replicas().stream().map(Node::id).collect(Collectors.toList()) + ) + )); + return res; + } + + /** + * Get the current replica assignments for some partitions. + * + * @param adminClient The AdminClient to use. + * @param partitions The partitions to get information about. + * @return A map from partitions to broker assignments. + * If any topic can't be found, an exception will be thrown. + */ + static Map<TopicPartition, List<Integer>> getReplicaAssignmentForPartitions(Admin adminClient, + Set<TopicPartition> partitions + ) throws ExecutionException, InterruptedException { + Map<TopicPartition, List<Integer>> res = new HashMap<>(); + describeTopics(adminClient, partitions.stream().map(TopicPartition::topic).collect(Collectors.toSet())).forEach((topicName, topicDescription) -> { + topicDescription.partitions().forEach(info -> { + TopicPartition tp = new TopicPartition(topicName, info.partition()); + if (partitions.contains(tp)) + res.put(tp, info.replicas().stream().map(Node::id).collect(Collectors.toList())); + }); + }); + return res; + } + + /** + * Find the rack information for some brokers. + * + * @param adminClient The AdminClient object. + * @param brokers The brokers to gather metadata about. + * @param enableRackAwareness True if we should return rack information, and throw an + * exception if it is inconsistent. + * + * @return The metadata for each broker that was found. + * Brokers that were not found will be omitted. + */ + static List<BrokerMetadata> getBrokerMetadata(Admin adminClient, List<Integer> brokers, boolean enableRackAwareness) throws ExecutionException, InterruptedException { + Set<Integer> brokerSet = new HashSet<>(brokers); + List<BrokerMetadata> results = adminClient.describeCluster().nodes().get().stream() + .filter(node -> brokerSet.contains(node.id())) + .map(node -> (enableRackAwareness && node.rack() != null) + ? new BrokerMetadata(node.id(), Optional.of(node.rack())) + : new BrokerMetadata(node.id(), Optional.empty()) + ).collect(Collectors.toList()); + + long numRackless = results.stream().filter(m -> !m.rack.isPresent()).count(); + if (enableRackAwareness && numRackless != 0 && numRackless != results.size()) { + throw new AdminOperationException("Not all brokers have rack information. Add " + + "--disable-rack-aware in command line to make replica assignment without rack " + + "information."); + } + return results; + } + + /** + * Parse and validate data gathered from the command-line for --generate + * In particular, we parse the JSON and validate that duplicate brokers and + * topics don't appear. + * + * @param reassignmentJson The JSON passed to --generate . + * @param brokerList A list of brokers passed to --generate. + * + * @return A tuple of brokers to reassign, topics to reassign + */ + static Tuple2<List<Integer>, List<String>> parseGenerateAssignmentArgs(String reassignmentJson, + String brokerList) throws JsonMappingException { + List<Integer> brokerListToReassign = Arrays.stream(brokerList.split(",")).map(Integer::parseInt).collect(Collectors.toList()); + Set<Integer> duplicateReassignments = ToolsUtils.duplicates(brokerListToReassign); + if (!duplicateReassignments.isEmpty()) + throw new AdminCommandFailedException(String.format("Broker list contains duplicate entries: %s", duplicateReassignments)); + List<String> topicsToReassign = parseTopicsData(reassignmentJson); + Set<String> duplicateTopicsToReassign = ToolsUtils.duplicates(topicsToReassign); + if (!duplicateTopicsToReassign.isEmpty()) + throw new AdminCommandFailedException(String.format("List of topics to reassign contains duplicate entries: %s", + duplicateTopicsToReassign)); + return new Tuple2<>(brokerListToReassign, topicsToReassign); + } + + /** + * The entry point for the --execute and --execute-additional commands. + * + * @param adminClient The AdminClient to use. + * @param additional Whether --additional was passed. + * @param reassignmentJson The JSON string to use for the topics to reassign. + * @param interBrokerThrottle The inter-broker throttle to use, or a negative + * number to skip using a throttle. + * @param logDirThrottle The replica log directory throttle to use, or a + * negative number to skip using a throttle. + * @param timeoutMs The maximum time in ms to wait for log directory + * replica assignment to begin. + * @param time The Time object to use. + */ + static void executeAssignment(Admin adminClient, + Boolean additional, + String reassignmentJson, + Long interBrokerThrottle, + Long logDirThrottle, + Long timeoutMs, + Time time + ) throws ExecutionException, InterruptedException, JsonProcessingException, TerseException { + Tuple2<Map<TopicPartition, List<Integer>>, Map<TopicPartitionReplica, String>> t0 = parseExecuteAssignmentArgs(reassignmentJson); + + Map<TopicPartition, List<Integer>> proposedParts = t0.v1; + Map<TopicPartitionReplica, String> proposedReplicas = t0.v2; + Map<TopicPartition, PartitionReassignment> currentReassignments = adminClient. + listPartitionReassignments().reassignments().get(); + // If there is an existing assignment, check for --additional before proceeding. + // This helps avoid surprising users. + if (!additional && !currentReassignments.isEmpty()) { + throw new TerseException(CANNOT_EXECUTE_BECAUSE_OF_EXISTING_MESSAGE); + } + Set<Integer> brokers = new HashSet<>(); + proposedParts.values().forEach(brokers::addAll); + + verifyBrokerIds(adminClient, brokers); + Map<TopicPartition, List<Integer>> currentParts = getReplicaAssignmentForPartitions(adminClient, proposedParts.keySet()); + System.out.println(currentPartitionReplicaAssignmentToString(proposedParts, currentParts)); + + if (interBrokerThrottle >= 0 || logDirThrottle >= 0) { + System.out.println(YOU_MUST_RUN_VERIFY_PERIODICALLY_MESSAGE); + + if (interBrokerThrottle >= 0) { + Map<String, Map<Integer, PartitionMove>> moveMap = calculateProposedMoveMap(currentReassignments, proposedParts, currentParts); + modifyReassignmentThrottle(adminClient, moveMap, interBrokerThrottle); + } + + if (logDirThrottle >= 0) { + Set<Integer> movingBrokers = calculateMovingBrokers(proposedReplicas.keySet()); + modifyLogDirThrottle(adminClient, movingBrokers, logDirThrottle); + } + } + + // Execute the partition reassignments. + Map<TopicPartition, Throwable> errors = alterPartitionReassignments(adminClient, proposedParts); + if (!errors.isEmpty()) { + throw new TerseException( + String.format("Error reassigning partition(s):%n%s", + errors.keySet().stream() + .sorted(ReassignPartitionsCommand::compareTopicPartitions) + .map(part -> part + ": " + errors.get(part).getMessage()) + .collect(Collectors.joining(System.lineSeparator())))); + } + System.out.printf("Successfully started partition reassignment%s for %s%n", + proposedParts.size() == 1 ? "" : "s", + proposedParts.keySet().stream() + .sorted(ReassignPartitionsCommand::compareTopicPartitions) + .map(Objects::toString) + .collect(Collectors.joining(","))); + if (!proposedReplicas.isEmpty()) { + executeMoves(adminClient, proposedReplicas, timeoutMs, time); + } + } + + /** + * Execute some partition log directory movements. + * + * @param adminClient The AdminClient to use. + * @param proposedReplicas A map from TopicPartitionReplicas to the + * directories to move them to. + * @param timeoutMs The maximum time in ms to wait for log directory + * replica assignment to begin. + * @param time The Time object to use. + */ + private static void executeMoves(Admin adminClient, + Map<TopicPartitionReplica, String> proposedReplicas, + Long timeoutMs, + Time time + ) throws InterruptedException, TerseException { + long startTimeMs = time.milliseconds(); + Map<TopicPartitionReplica, String> pendingReplicas = new HashMap<>(); + pendingReplicas.putAll(proposedReplicas); + boolean done = false; + do { + Set<TopicPartitionReplica> completed = alterReplicaLogDirs(adminClient, pendingReplicas); + if (!completed.isEmpty()) { + System.out.printf("Successfully started log directory move%s for: %s%n", + completed.size() == 1 ? "" : "s", + completed.stream() + .sorted(ReassignPartitionsCommand::compareTopicPartitionReplicas) + .map(Object::toString) + .collect(Collectors.joining(","))); + } + completed.forEach(pendingReplicas::remove); + if (pendingReplicas.isEmpty()) { + done = true; + } else if (time.milliseconds() >= startTimeMs + timeoutMs) { + throw new TerseException(String.format( + "Timed out before log directory move%s could be started for: %s", + pendingReplicas.size() == 1 ? "" : "s", + pendingReplicas.keySet().stream() + .sorted(ReassignPartitionsCommand::compareTopicPartitionReplicas) + .map(Object::toString) + .collect(Collectors.joining(",")))); + } else { + // If a replica has been moved to a new host and we also specified a particular + // log directory, we will have to keep retrying the alterReplicaLogDirs + // call. It can't take effect until the replica is moved to that host. + time.sleep(100); + } + + + } while (!done); + } + + /** + * Entry point for the --list command. + * + * @param adminClient The AdminClient to use. + */ + private static void listReassignments(Admin adminClient) throws ExecutionException, InterruptedException { + System.out.println(curReassignmentsToString(adminClient)); + } + + /** + * Convert the current partition reassignments to text. + * + * @param adminClient The AdminClient to use. + * @return A string describing the current partition reassignments. + */ + static String curReassignmentsToString(Admin adminClient) throws ExecutionException, InterruptedException { + Map<TopicPartition, PartitionReassignment> currentReassignments = adminClient. + listPartitionReassignments().reassignments().get(); + String text = currentReassignments.keySet().stream().sorted(ReassignPartitionsCommand::compareTopicPartitions).map(part -> { + PartitionReassignment reassignment = currentReassignments.get(part); + List<Integer> replicas = reassignment.replicas(); + List<Integer> addingReplicas = reassignment.addingReplicas(); + List<Integer> removingReplicas = reassignment.removingReplicas(); + + return String.format("%s: replicas: %s.%s%s", + part, + replicas.stream().map(Object::toString).collect(Collectors.joining(",")), + addingReplicas.isEmpty() ? "" : String.format(" adding: %s.", addingReplicas.stream() + .map(Object::toString) + .collect(Collectors.joining(","))), + removingReplicas.isEmpty() ? "" : String.format(" removing: %s.", removingReplicas.stream() + .map(Object::toString) + .collect(Collectors.joining(","))) + ); + }).collect(Collectors.joining(System.lineSeparator())); + + return text.isEmpty() + ? "No partition reassignments found." + : String.format("Current partition reassignments:%n%s", text); + } + + /** + * Verify that all the brokers in an assignment exist. + * + * @param adminClient The AdminClient to use. + * @param brokers The broker IDs to verify. + */ + private static void verifyBrokerIds(Admin adminClient, Set<Integer> brokers) throws ExecutionException, InterruptedException { + Set<Integer> allNodeIds = adminClient.describeCluster().nodes().get().stream().map(Node::id).collect(Collectors.toSet()); + Optional<Integer> unknown = brokers.stream() + .filter(brokerId -> !allNodeIds.contains(brokerId)) + .findFirst(); + if (unknown.isPresent()) + throw new AdminCommandFailedException("Unknown broker id " + unknown.get()); + } + + /** + * Return the string which we want to print to describe the current partition assignment. + * + * @param proposedParts The proposed partition assignment. + * @param currentParts The current partition assignment. + * + * @return The string to print. We will only print information about + * partitions that appear in the proposed partition assignment. + */ + static String currentPartitionReplicaAssignmentToString(Map<TopicPartition, List<Integer>> proposedParts, + Map<TopicPartition, List<Integer>> currentParts) throws JsonProcessingException { + Map<TopicPartition, List<Integer>> partitionsToBeReassigned = currentParts.entrySet().stream() + .filter(e -> proposedParts.containsKey(e.getKey())) + .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)); + + return String.format("Current partition replica assignment%n%n%s%n%nSave this to use as the %s", + formatAsReassignmentJson(partitionsToBeReassigned, Collections.emptyMap()), + "--reassignment-json-file option during rollback"); + } + + /** + * Execute the given partition reassignments. + * + * @param adminClient The admin client object to use. + * @param reassignments A map from topic names to target replica assignments. + * @return A map from partition objects to error strings. + */ + static Map<TopicPartition, Throwable> alterPartitionReassignments(Admin adminClient, + Map<TopicPartition, List<Integer>> reassignments) throws InterruptedException { + Map<TopicPartition, Optional<NewPartitionReassignment>> args = new HashMap<>(); + reassignments.entrySet().forEach(e -> { + TopicPartition part = e.getKey(); + List<Integer> replicas = e.getValue(); + + args.put(part, Optional.of(new NewPartitionReassignment(replicas))); + }); Review Comment: ```suggestion reassignments.forEach((part, replicas) -> args.put(part, Optional.of(new NewPartitionReassignment(replicas)))); ``` -- This is an automated message from the Apache Git Service. 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