Github user senorcarbone commented on a diff in the pull request: https://github.com/apache/flink/pull/1668#discussion_r108152267 --- 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 -- Hm, not really. I cannot think of a possible usage of loaded operators in IterationSink tasks in the future too.
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