Github user bjlovegithub commented on the issue:
https://github.com/apache/flink/pull/2629
Maybe this is a solution. We will not think about changing the type of
`checkpointLock`, which is an `Object` ans quite efficient, and not change the
order of `broadcastBarriers` and `operator.snapshotState()`. By placing
**pause** `EmitterThread` codes in `StreamTask.performCheckpoint()`, like this:
` private boolean performCheckpoint(CheckpointMetaData
checkpointMetaData) throws Exception {
LOG.debug("Starting checkpoint {} on task {}",
checkpointMetaData.getCheckpointId(), getName());
synchronized (lock) {
if (isRunning) {
// stop working threads first.
for (StreamOperator operator :
operatorChain.getAllOperators()) {
if (operator instanceof
AsyncWaitOperator) {
operator.pauseEmitterThread();
}
}
// broadcast barriers after snapshot operators'
states.
operatorChain.broadcastCheckpointBarrier(
checkpointMetaData.getCheckpointId(), checkpointMetaData.getTimestamp()
);
checkpointState(checkpointMetaData);
return true;
} else {
return false;
}
}
}`
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