Add AcknowledgementSet support to DocumentDB/MongoDB streams #4379
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,45 @@ | ||
| package org.opensearch.dataprepper.plugins.mongo.model; | ||
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| public class CheckpointStatus { | ||
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There was a problem hiding this comment. This class is only used by |
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| private final String resumeToken; | ||
| private final long recordCount; | ||
| private boolean acknowledged; | ||
| private final long createTimestamp; | ||
| private Long acknowledgedTimestamp; | ||
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| public CheckpointStatus(final String resumeToken, final long recordCount, final long createTimestamp) { | ||
| this.resumeToken = resumeToken; | ||
| this.recordCount = recordCount; | ||
| this.acknowledged = false; | ||
| this.createTimestamp = createTimestamp; | ||
| } | ||
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| public void setAcknowledgedTimestamp(final Long acknowledgedTimestamp) { | ||
| this.acknowledgedTimestamp = acknowledgedTimestamp; | ||
| } | ||
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| public void setAcknowledged(boolean acknowledged) { | ||
| this.acknowledged = acknowledged; | ||
| } | ||
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| public String getResumeToken() { | ||
| return resumeToken; | ||
| } | ||
| public long getRecordCount() { | ||
| return recordCount; | ||
| } | ||
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| public boolean isAcknowledged() { | ||
| return acknowledged; | ||
| } | ||
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| public long getCreateTimestamp() { | ||
| return createTimestamp; | ||
| } | ||
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| public long getAcknowledgedTimestamp() { | ||
| return acknowledgedTimestamp; | ||
| } | ||
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| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| package org.opensearch.dataprepper.plugins.mongo.stream; | ||
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| import com.google.common.annotations.VisibleForTesting; | ||
| import org.opensearch.dataprepper.model.acknowledgements.AcknowledgementSet; | ||
| import org.opensearch.dataprepper.model.acknowledgements.AcknowledgementSetManager; | ||
| import org.opensearch.dataprepper.plugins.mongo.model.CheckpointStatus; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.time.Duration; | ||
| import java.time.Instant; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.concurrent.ConcurrentLinkedQueue; | ||
| import java.util.concurrent.ExecutorService; | ||
| import java.util.concurrent.Executors; | ||
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| public class StreamAcknowledgementManager { | ||
| private static final Logger LOG = LoggerFactory.getLogger(StreamAcknowledgementManager.class); | ||
| private final ConcurrentLinkedQueue<CheckpointStatus> checkpoints = new ConcurrentLinkedQueue<>(); | ||
| private final ConcurrentHashMap<String, CheckpointStatus> ackStatus = new ConcurrentHashMap<>(); | ||
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| private final AcknowledgementSetManager acknowledgementSetManager; | ||
| private final DataStreamPartitionCheckpoint partitionCheckpoint; | ||
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| private final Duration partitionAcknowledgmentTimeout; | ||
| private final int acknowledgementMonitorWaitTimeInMs; | ||
| private final int checkPointIntervalInMs; | ||
| private final ExecutorService executorService; | ||
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| private boolean enableAcknowledgement = false; | ||
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| public StreamAcknowledgementManager(final AcknowledgementSetManager acknowledgementSetManager, | ||
| final DataStreamPartitionCheckpoint partitionCheckpoint, | ||
| final Duration partitionAcknowledgmentTimeout, | ||
| final int acknowledgementMonitorWaitTimeInMs, | ||
| final int checkPointIntervalInMs) { | ||
| this.acknowledgementSetManager = acknowledgementSetManager; | ||
| this.partitionCheckpoint = partitionCheckpoint; | ||
| this.partitionAcknowledgmentTimeout = partitionAcknowledgmentTimeout; | ||
| this.acknowledgementMonitorWaitTimeInMs = acknowledgementMonitorWaitTimeInMs; | ||
| this.checkPointIntervalInMs = checkPointIntervalInMs; | ||
| executorService = Executors.newSingleThreadExecutor(); | ||
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There was a problem hiding this comment. Let's use the Here is an example of using it: This thread factory will give us more useful names and also make the thread a daemon thread to ensure Data Prepper shuts down properly. |
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| } | ||
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| void init() { | ||
| enableAcknowledgement = true; | ||
| final Thread currentThread = Thread.currentThread(); | ||
| executorService.submit(() -> monitorCheckpoints(executorService, currentThread)); | ||
| } | ||
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| private void monitorCheckpoints(final ExecutorService executorService, final Thread parentThread) { | ||
| long lastCheckpointTime = System.currentTimeMillis(); | ||
| CheckpointStatus lastCheckpointStatus = null; | ||
| while (!Thread.currentThread().isInterrupted()) { | ||
| final CheckpointStatus checkpointStatus = checkpoints.peek(); | ||
| if (checkpointStatus != null) { | ||
| if (checkpointStatus.isAcknowledged()) { | ||
| lastCheckpointStatus = checkpoints.poll(); | ||
| ackStatus.remove(checkpointStatus.getResumeToken()); | ||
| if (System.currentTimeMillis() - lastCheckpointTime >= checkPointIntervalInMs) { | ||
| LOG.debug("Perform regular checkpointing for resume token {} at record count {}", checkpointStatus.getResumeToken(), checkpointStatus.getRecordCount()); | ||
| partitionCheckpoint.checkpoint(checkpointStatus.getResumeToken(), checkpointStatus.getRecordCount()); | ||
| lastCheckpointTime = System.currentTimeMillis(); | ||
| } | ||
| } else { | ||
| LOG.debug("Checkpoint not complete for resume token {}", checkpointStatus.getResumeToken()); | ||
| final Duration ackWaitDuration = Duration.between(Instant.ofEpochMilli(checkpointStatus.getCreateTimestamp()), Instant.now()); | ||
| // Acknowledgement not received for the checkpoint after twice ack wait time | ||
| if (ackWaitDuration.getSeconds() > partitionAcknowledgmentTimeout.getSeconds() * 2) { | ||
| // Give up partition and should interrupt parent thread to stop processing stream | ||
| if (lastCheckpointStatus != null && lastCheckpointStatus.isAcknowledged()) { | ||
| partitionCheckpoint.checkpoint(lastCheckpointStatus.getResumeToken(), lastCheckpointStatus.getRecordCount()); | ||
| } | ||
| LOG.warn("Acknowledgement not received for the checkpoint {} past wait time. Giving up partition.", checkpointStatus.getResumeToken()); | ||
| partitionCheckpoint.giveUpPartition(); | ||
| Thread.currentThread().interrupt(); | ||
| } | ||
| } | ||
| } | ||
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| try { | ||
| Thread.sleep(acknowledgementMonitorWaitTimeInMs); | ||
| } catch (InterruptedException ex) { | ||
| Thread.currentThread().interrupt(); | ||
| } | ||
| } | ||
| parentThread.interrupt(); | ||
| executorService.shutdown(); | ||
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There was a problem hiding this comment. Should L88-L89 be in init method instead of the callable? There was a problem hiding this comment. No, once this monitor exists because of ack wait timeout, it should stop the stream worker. |
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| } | ||
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| Optional<AcknowledgementSet> createAcknowledgementSet(final String resumeToken, final long recordNumber) { | ||
| if (!enableAcknowledgement) { | ||
| return Optional.empty(); | ||
| } | ||
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| final CheckpointStatus checkpointStatus = new CheckpointStatus(resumeToken, recordNumber, Instant.now().toEpochMilli()); | ||
| checkpoints.add(checkpointStatus); | ||
| ackStatus.put(resumeToken, checkpointStatus); | ||
| return Optional.of(acknowledgementSetManager.create((result) -> { | ||
| if (result) { | ||
| final CheckpointStatus ackCheckpointStatus = ackStatus.get(resumeToken); | ||
| ackCheckpointStatus.setAcknowledgedTimestamp(Instant.now().toEpochMilli()); | ||
| ackCheckpointStatus.setAcknowledged(true); | ||
| LOG.debug("Received acknowledgment of completion from sink for checkpoint {}", resumeToken); | ||
| } else { | ||
| LOG.warn("Negative acknowledgment received for checkpoint {}, resetting checkpoint", resumeToken); | ||
| // default CheckpointStatus acknowledged value is false. The monitorCheckpoints method will time out | ||
| // and reprocess stream from last successful checkpoint in the order. | ||
| } | ||
| }, partitionAcknowledgmentTimeout)); | ||
| } | ||
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| void shutdown() { | ||
| executorService.shutdown(); | ||
| } | ||
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| @VisibleForTesting | ||
| ConcurrentHashMap<String, CheckpointStatus> getAcknowledgementStatus() { | ||
| return ackStatus; | ||
| } | ||
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| @VisibleForTesting | ||
| ConcurrentLinkedQueue<CheckpointStatus> getCheckpoints() { | ||
| return checkpoints; | ||
| } | ||
| } | ||
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Also, use the
BackgroundThreadFactoryhere.There was a problem hiding this comment.
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Done