MartijnVisser commented on code in PR #29548:
URL: https://github.com/apache/flink/pull/29548#discussion_r4360639822
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flink-runtime/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java:
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@@ -1816,13 +1819,64 @@
List<RecordWriter<SerializationDelegate<StreamRecord<OUT>>>> createRecordWriters
private static void
replaceForwardPartitionerIfConsumerParallelismDoesNotMatch(
Environment environment, NonChainedOutput streamOutput, int
outputIndex) {
- if (streamOutput.getPartitioner() instanceof ForwardPartitioner
- &&
environment.getWriter(outputIndex).getNumberOfSubpartitions()
- !=
environment.getTaskInfo().getNumberOfParallelSubtasks()) {
- LOG.debug(
- "Replacing forward partitioner with rebalance for {}",
- environment.getTaskInfo().getTaskNameWithSubtasks());
- streamOutput.setPartitioner(new RebalancePartitioner<>());
+ final int producerParallelism =
environment.getTaskInfo().getNumberOfParallelSubtasks();
+ // The number of subpartitions isn't the consumer parallelism on a
POINTWISE edge, so the
+ // actual consumer parallelism is passed through the deployment
descriptor.
+ final int consumerParallelism =
environment.getWriterConsumerParallelism(outputIndex);
Review Comment:
I think this turns a forward edge overridden from 2 to 4 into a real
rebalance by default; before, only consumers 0 and 2 got data. Is that intended
for a patch release?
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