zhijiangW commented on a change in pull request #11515: [FLINK-16744][task]
implement channel state persistence for unaligned checkpoints
URL: https://github.com/apache/flink/pull/11515#discussion_r405298804
##########
File path:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/SubtaskCheckpointCoordinatorImpl.java
##########
@@ -188,6 +221,77 @@ public void checkpointState(
}
}
+ private OperatorSnapshotFutures buildOperatorSnapshotFutures(
+ CheckpointMetaData checkpointMetaData,
+ CheckpointOptions checkpointOptions,
+ OperatorChain<?, ?> operatorChain,
+ StreamOperator<?> op,
+ Supplier<Boolean> isCanceled,
+ ChannelStateWriteResult channelStateWriteResult) throws
Exception {
+ CheckpointStreamFactory storage =
checkpointStorage.resolveCheckpointStorageLocation(
+ checkpointMetaData.getCheckpointId(),
+ checkpointOptions.getTargetLocation());
+ OperatorSnapshotFutures snapshotInProgress =
checkpointStreamOperator(
+ op,
+ checkpointMetaData,
+ checkpointOptions,
+ storage,
+ isCanceled);
+ if (op == operatorChain.getHeadOperator()) {
+ snapshotInProgress.setInputChannelStateFuture(
+ channelStateWriteResult
+ .getInputChannelStateHandles()
+ .thenApply(StateObjectCollection::new)
+ .thenApply(SnapshotResult::of));
+ }
+ if (op == operatorChain.getTailOperator()) {
+ snapshotInProgress.setResultSubpartitionStateFuture(
+ channelStateWriteResult
+ .getResultSubpartitionStateHandles()
+ .thenApply(StateObjectCollection::new)
+ .thenApply(SnapshotResult::of));
+ }
+ return snapshotInProgress;
+ }
+
+ @Override
+ public void close() throws IOException {
+ channelStateWriter.close();
+ }
+
+ // Caches checkpoint output stream factories to prevent multiple output
stream per checkpoint.
+ // This could result from requesting output stream by different
entities (this and channelStateWriter)
+ // We can't just pass a stream to the channelStateWriter because it can
receive checkpoint call earlier than this class
+ // in some unaligned checkpoints scenarios
+ private static class CachingCheckpointStorageWorkerView implements
CheckpointStorageWorkerView {
Review comment:
Do we have the tests coverage for this new introduced caching function in
the commit "[FLINK-16744][task] send channel state handles to JM"?
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