Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/1668#discussion_r108034229
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamIterationTail.java
---
@@ -64,6 +70,22 @@ public void init() throws Exception {
super.init();
}
+ @Override
+ protected boolean performCheckpoint(CheckpointMetaData
checkpointMetaData, CheckpointOptions checkpointOptions, CheckpointMetrics
checkpointMetrics) throws Exception {
+ LOG.debug("Starting checkpoint {} on task {}",
checkpointMetaData.getCheckpointId(), getName());
+
+ synchronized (getCheckpointLock()) {
+ if (isRunning()) {
+ dataChannel.put(new Either.Right(new
CheckpointBarrier(checkpointMetaData.getCheckpointId(),
checkpointMetaData.getTimestamp(), checkpointOptions)));
+
getEnvironment().acknowledgeCheckpoint(checkpointMetaData.getCheckpointId(),
checkpointMetrics);
--- End diff --
Can the `IterationTailTask` contain operators as well, or is it always a
task without operators? If it has operators, we cannot immediately acknowledge
here, but need to delegate to superclass checkpoint method instead.
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