ifndef-SleePy commented on code in PR #8401: URL: https://github.com/apache/paimon/pull/8401#discussion_r3503494929
########## paimon-flink/paimon-flink-common/src/main/java/org/apache/paimon/flink/sink/coordinator/CommittingWriteOperatorCoordinator.java: ########## @@ -0,0 +1,535 @@ +/* + * 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.paimon.flink.sink.coordinator; + +import org.apache.paimon.annotation.VisibleForTesting; +import org.apache.paimon.flink.sink.Committable; +import org.apache.paimon.flink.sink.Committer; +import org.apache.paimon.flink.sink.state.CoordinatorState; +import org.apache.paimon.flink.sink.state.CoordinatorStateSerializer; +import org.apache.paimon.flink.sink.state.MemoryBackendStateStore; +import org.apache.paimon.manifest.ManifestCommittable; + +import org.apache.flink.api.common.typeutils.base.ListSerializer; +import org.apache.flink.core.io.SimpleVersionedSerialization; +import org.apache.flink.runtime.jobgraph.OperatorID; +import org.apache.flink.runtime.operators.coordination.OperatorCoordinator; +import org.apache.flink.runtime.operators.coordination.OperatorEvent; +import org.apache.flink.runtime.operators.coordination.RecreateOnResetOperatorCoordinator; +import org.apache.flink.util.function.ThrowingRunnable; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.Map; +import java.util.NavigableMap; +import java.util.TreeMap; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; + +import static org.apache.paimon.utils.Preconditions.checkState; + +/** + * {@link OperatorCoordinator} that runs the Paimon committer on the JobManager for the + * unaware-bucket append write path. Writers stream per-checkpoint committables to this coordinator + * over the {@link OperatorEvent} channel; on {@link #notifyCheckpointComplete} the coordinator + * aligns committables across subtasks and commits them from a dedicated single-thread executor, so + * the JM main thread is never blocked by table I/O. + * + * <p>Wrap this class with a {@link RecreateOnResetOperatorCoordinator} (see {@link Provider}). The + * wrapper discards this instance on global failover and creates a new one in its place, which keeps + * the lifecycle inside a single instance simple. See {@link #resetToCheckpoint} and {@link State} + * for the resulting state machine. + */ +public class CommittingWriteOperatorCoordinator implements OperatorCoordinator { + + private static final Logger LOG = + LoggerFactory.getLogger(CommittingWriteOperatorCoordinator.class); + + private static final long NO_WATERMARK = Long.MIN_VALUE; + + private final OperatorCoordinator.Context context; + private final Committer.Factory<Committable, ManifestCommittable> committerFactory; + private final boolean streamingCheckpointEnabled; + private final boolean failoverAfterRecovery; + private final int parallelism; + + private final WriterCommittables[] subtaskCommittables; + private final ListSerializer<Committable> committableSerializer; + private final CoordinatorStateSerializer stateSerializer; + private final ExecutorService commitExecutor; + + // Populated by resetToCheckpoint and consumed by start. Plain fields are sufficient: both + // callbacks run on the same scheduler thread in order. + private long restoredCheckpointId = OperatorCoordinator.NO_CHECKPOINT; + private byte[] restoredCheckpointData; + + private State state; + private Committer<Committable, ManifestCommittable> committer; + private String commitUser; + private MemoryBackendStateStore stateStore; + + public CommittingWriteOperatorCoordinator( + OperatorCoordinator.Context context, + Committer.Factory<Committable, ManifestCommittable> committerFactory, + boolean streamingCheckpointEnabled, + String initialCommitUser, + boolean failoverAfterRecovery) { + this.context = context; + this.committerFactory = committerFactory; + this.streamingCheckpointEnabled = streamingCheckpointEnabled; + this.commitUser = initialCommitUser; + this.failoverAfterRecovery = failoverAfterRecovery; + this.parallelism = context.currentParallelism(); + this.subtaskCommittables = new WriterCommittables[parallelism]; + this.committableSerializer = CommittableEvent.createCommittableListSerializer(); + this.stateSerializer = new CoordinatorStateSerializer(); + this.commitExecutor = + Executors.newSingleThreadExecutor( + new CoordinatorExecutorThreadFactory("WriteCommitCoordinator", context)); + this.state = State.CREATED; + } + + @Override + public void start() throws Exception { + // Invoked at most once. If resetToCheckpoint ran first it already moved state to RESTORING + // and stashed the bytes; otherwise we are in CREATED and there is nothing to restore. + checkState( + state == State.CREATED || state == State.RESTORING, + "Coordinator already started, illegal state %s", + state); + runInEventLoop( + () -> { + if (state == State.RESTORING) { + restoreState(restoredCheckpointId, restoredCheckpointData); + // not needed after deserialization; release the reference + restoredCheckpointData = null; + initializeCommitter(); + // stay in RESTORING until writers re-emit committables and align catches up + } else { + restoreState(OperatorCoordinator.NO_CHECKPOINT, null); + initializeCommitter(); + transitionState(State.RUNNING); + } + }, + "starting"); + } + + @Override + public void close() throws Exception { + transitionState(State.CLOSED); + if (commitExecutor != null) { + commitExecutor.shutdownNow(); + } + if (committer != null) { + committer.close(); + committer = null; + } + } + + @Override + public void checkpointCoordinator(long checkpointId, CompletableFuture<byte[]> result) { + runInEventLoop( + () -> { + if (state != State.RUNNING) { + // if checkpoint is executed before finishing restoring, just fail it + result.completeExceptionally( + new IllegalStateException( + "Checkpoint of commit coordinator should be taken in RUNNING state, while current state is " + + state)); + return; + } + committer.snapshotState(); Review Comment: Nice catch, fixed. -- This is an automated message from the Apache Git Service. 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