chia7712 commented on code in PR #17011:
URL: https://github.com/apache/kafka/pull/17011#discussion_r2680957131
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share-coordinator/src/main/java/org/apache/kafka/coordinator/share/ShareCoordinatorShard.java:
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@@ -17,58 +17,565 @@
package org.apache.kafka.coordinator.share;
+import org.apache.kafka.common.TopicPartition;
+import org.apache.kafka.common.Uuid;
import org.apache.kafka.common.message.ReadShareGroupStateRequestData;
import org.apache.kafka.common.message.ReadShareGroupStateResponseData;
import org.apache.kafka.common.message.WriteShareGroupStateRequestData;
import org.apache.kafka.common.message.WriteShareGroupStateResponseData;
-import org.apache.kafka.common.requests.RequestContext;
+import org.apache.kafka.common.protocol.ApiMessage;
+import org.apache.kafka.common.protocol.Errors;
+import org.apache.kafka.common.requests.ReadShareGroupStateResponse;
import org.apache.kafka.common.requests.TransactionResult;
+import org.apache.kafka.common.requests.WriteShareGroupStateResponse;
+import org.apache.kafka.common.utils.LogContext;
+import org.apache.kafka.common.utils.Time;
+import org.apache.kafka.coordinator.common.runtime.CoordinatorMetrics;
+import org.apache.kafka.coordinator.common.runtime.CoordinatorMetricsShard;
import org.apache.kafka.coordinator.common.runtime.CoordinatorRecord;
import org.apache.kafka.coordinator.common.runtime.CoordinatorResult;
import org.apache.kafka.coordinator.common.runtime.CoordinatorShard;
+import org.apache.kafka.coordinator.common.runtime.CoordinatorShardBuilder;
+import org.apache.kafka.coordinator.common.runtime.CoordinatorTimer;
+import org.apache.kafka.coordinator.share.generated.ShareSnapshotKey;
+import org.apache.kafka.coordinator.share.generated.ShareSnapshotValue;
+import org.apache.kafka.coordinator.share.generated.ShareUpdateKey;
+import org.apache.kafka.coordinator.share.generated.ShareUpdateValue;
+import org.apache.kafka.coordinator.share.metrics.ShareCoordinatorMetrics;
+import org.apache.kafka.coordinator.share.metrics.ShareCoordinatorMetricsShard;
import org.apache.kafka.image.MetadataDelta;
import org.apache.kafka.image.MetadataImage;
+import org.apache.kafka.server.common.ApiMessageAndVersion;
+import org.apache.kafka.server.config.ShareCoordinatorConfig;
+import org.apache.kafka.server.group.share.PartitionFactory;
+import org.apache.kafka.server.group.share.SharePartitionKey;
+import org.apache.kafka.timeline.SnapshotRegistry;
+import org.apache.kafka.timeline.TimelineHashMap;
+
+import org.slf4j.Logger;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedHashSet;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import java.util.stream.Collectors;
-/**
- * The share coordinator shard is a replicated state machine that manages the
metadata of all
- * share partitions. It holds the hard and the soft state of the share
partitions. This class
- * has two kinds of methods:
- * 1) The request handlers which handle the requests and generate a response
and records to
- * mutate the hard state. Those records will be written by the runtime and
applied to the
- * hard state via the replay methods.
- * 2) The replay methods which apply records to the hard state. Those are used
in the request
- * handling as well as during the initial loading of the records from the
partitions.
- */
public class ShareCoordinatorShard implements
CoordinatorShard<CoordinatorRecord> {
+ private final Logger log;
+ private final ShareCoordinatorConfig config;
+ private final CoordinatorMetrics coordinatorMetrics;
+ private final CoordinatorMetricsShard metricsShard;
+ private final TimelineHashMap<SharePartitionKey, ShareGroupOffset>
shareStateMap; // coord key -> ShareGroupOffset
+ // leaderEpochMap can be updated by writeState call
+ // or if a newer leader makes a readState call.
+ private final TimelineHashMap<SharePartitionKey, Integer> leaderEpochMap;
+ private final TimelineHashMap<SharePartitionKey, Integer>
snapshotUpdateCount;
+ private final TimelineHashMap<SharePartitionKey, Integer> stateEpochMap;
+ private MetadataImage metadataImage;
+
+ public static final Exception NULL_TOPIC_ID = new Exception("The topic id
cannot be null.");
+ public static final Exception NEGATIVE_PARTITION_ID = new Exception("The
partition id cannot be a negative number.");
+
+ public static class Builder implements
CoordinatorShardBuilder<ShareCoordinatorShard, CoordinatorRecord> {
+ private ShareCoordinatorConfig config;
+ private LogContext logContext;
+ private SnapshotRegistry snapshotRegistry;
+ private CoordinatorMetrics coordinatorMetrics;
+ private TopicPartition topicPartition;
+
+ public Builder(ShareCoordinatorConfig config) {
+ this.config = config;
+ }
+
+ @Override
+ public CoordinatorShardBuilder<ShareCoordinatorShard,
CoordinatorRecord> withSnapshotRegistry(SnapshotRegistry snapshotRegistry) {
+ this.snapshotRegistry = snapshotRegistry;
+ return this;
+ }
+
+ @Override
+ public CoordinatorShardBuilder<ShareCoordinatorShard,
CoordinatorRecord> withLogContext(LogContext logContext) {
+ this.logContext = logContext;
+ return this;
+ }
+
+ @Override
+ public CoordinatorShardBuilder<ShareCoordinatorShard,
CoordinatorRecord> withTime(Time time) {
+ // method is required due to interface
+ return this;
+ }
+
+ @Override
+ public CoordinatorShardBuilder<ShareCoordinatorShard,
CoordinatorRecord> withTimer(CoordinatorTimer<Void, CoordinatorRecord> timer) {
+ // method is required due to interface
+ return this;
+ }
+
+ @Override
+ public CoordinatorShardBuilder<ShareCoordinatorShard,
CoordinatorRecord> withCoordinatorMetrics(CoordinatorMetrics
coordinatorMetrics) {
+ this.coordinatorMetrics = coordinatorMetrics;
+ return this;
+ }
+
+ @Override
+ public CoordinatorShardBuilder<ShareCoordinatorShard,
CoordinatorRecord> withTopicPartition(TopicPartition topicPartition) {
+ this.topicPartition = topicPartition;
+ return this;
+ }
+
+ @Override
+ @SuppressWarnings("NPathComplexity")
+ public ShareCoordinatorShard build() {
+ if (logContext == null) logContext = new LogContext();
+ if (config == null)
+ throw new IllegalArgumentException("Config must be set.");
+ if (snapshotRegistry == null)
+ throw new IllegalArgumentException("SnapshotRegistry must be
set.");
+ if (coordinatorMetrics == null || !(coordinatorMetrics instanceof
ShareCoordinatorMetrics))
+ throw new IllegalArgumentException("CoordinatorMetrics must be
set and be of type ShareCoordinatorMetrics.");
+ if (topicPartition == null)
+ throw new IllegalArgumentException("TopicPartition must be
set.");
+
+ ShareCoordinatorMetricsShard metricsShard =
((ShareCoordinatorMetrics) coordinatorMetrics)
+ .newMetricsShard(snapshotRegistry, topicPartition);
+
+ return new ShareCoordinatorShard(
+ logContext,
+ config,
+ coordinatorMetrics,
+ metricsShard,
+ snapshotRegistry
+ );
+ }
+ }
+
+ ShareCoordinatorShard(
+ LogContext logContext,
+ ShareCoordinatorConfig config,
+ CoordinatorMetrics coordinatorMetrics,
+ CoordinatorMetricsShard metricsShard,
+ SnapshotRegistry snapshotRegistry
+ ) {
+ this.log = logContext.logger(ShareCoordinatorShard.class);
+ this.config = config;
+ this.coordinatorMetrics = coordinatorMetrics;
+ this.metricsShard = metricsShard;
+ this.shareStateMap = new TimelineHashMap<>(snapshotRegistry, 0);
+ this.leaderEpochMap = new TimelineHashMap<>(snapshotRegistry, 0);
+ this.snapshotUpdateCount = new TimelineHashMap<>(snapshotRegistry, 0);
+ this.stateEpochMap = new TimelineHashMap<>(snapshotRegistry, 0);
+ }
+
@Override
public void onLoaded(MetadataImage newImage) {
- CoordinatorShard.super.onLoaded(newImage);
+ this.metadataImage = newImage;
+ coordinatorMetrics.activateMetricsShard(metricsShard);
}
@Override
public void onNewMetadataImage(MetadataImage newImage, MetadataDelta
delta) {
- CoordinatorShard.super.onNewMetadataImage(newImage, delta);
+ this.metadataImage = newImage;
}
@Override
public void onUnloaded() {
- CoordinatorShard.super.onUnloaded();
+ coordinatorMetrics.deactivateMetricsShard(metricsShard);
}
@Override
public void replay(long offset, long producerId, short producerEpoch,
CoordinatorRecord record) throws RuntimeException {
+ ApiMessageAndVersion key = record.key();
+ ApiMessageAndVersion value = record.value();
+
+ switch (key.version()) {
+ case ShareCoordinator.SHARE_SNAPSHOT_RECORD_KEY_VERSION: //
ShareSnapshot
+ handleShareSnapshot((ShareSnapshotKey) key.message(),
(ShareSnapshotValue) messageOrNull(value));
+ break;
+ case ShareCoordinator.SHARE_UPDATE_RECORD_KEY_VERSION: //
ShareUpdate
+ handleShareUpdate((ShareUpdateKey) key.message(),
(ShareUpdateValue) messageOrNull(value));
+ break;
+ default:
+ // noop
+ }
+ }
+
+ private void handleShareSnapshot(ShareSnapshotKey key, ShareSnapshotValue
value) {
+ SharePartitionKey mapKey =
SharePartitionKey.getInstance(key.groupId(), key.topicId(), key.partition());
+ maybeUpdateLeaderEpochMap(mapKey, value.leaderEpoch());
+ maybeUpdateStateEpochMap(mapKey, value.stateEpoch());
+
+ ShareGroupOffset offsetRecord = ShareGroupOffset.fromRecord(value);
+ // this record is the complete snapshot
+ shareStateMap.put(mapKey, offsetRecord);
+ // if number of share updates is exceeded, then reset it
+ if (snapshotUpdateCount.containsKey(mapKey)) {
+ if (snapshotUpdateCount.get(mapKey) >=
config.shareCoordinatorSnapshotUpdateRecordsPerSnapshot()) {
+ snapshotUpdateCount.put(mapKey, 0);
+ }
+ }
+ }
+
+ private void handleShareUpdate(ShareUpdateKey key, ShareUpdateValue value)
{
+ SharePartitionKey mapKey =
SharePartitionKey.getInstance(key.groupId(), key.topicId(), key.partition());
+ maybeUpdateLeaderEpochMap(mapKey, value.leaderEpoch());
+
+ // share update does not hold state epoch information.
+
+ ShareGroupOffset offsetRecord = ShareGroupOffset.fromRecord(value);
+ // this is an incremental snapshot
+ // so, we need to apply it to our current soft state
+ shareStateMap.compute(mapKey, (k, v) -> v == null ? offsetRecord :
merge(v, value));
+ snapshotUpdateCount.compute(mapKey, (k, v) -> v == null ? 0 : v + 1);
Review Comment:
I will file a patch if it gets confirmed :)
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