Zhu Zhu created FLINK-21707:
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Summary: Job is possible to hang when restarting a FINISHED task
with POINTWISE BLOCKING consumers
Key: FLINK-21707
URL: https://issues.apache.org/jira/browse/FLINK-21707
Project: Flink
Issue Type: Bug
Components: Runtime / Coordination
Affects Versions: 1.12.2, 1.11.3, 1.13.0
Reporter: Zhu Zhu
Job is possible to hang when restarting a FINISHED task with POINTWISE BLOCKING
consumers. This is because
{{PipelinedRegionSchedulingStrategy#onExecutionStateChange()}} will try to
schedule all the consumer tasks/regions of the finished *ExecutionJobVertex*,
even though the regions are not the exact consumers of the finished
*ExecutionVertex*. In this case, some of the regions can be in state other than
CREATED because they are not connected to and affected by the restarted tasks.
However, {{PipelinedRegionSchedulingStrategy#maybeScheduleRegion()}} does not
allow to schedule a non-CREATED region and will throw an Exception and breaks
the scheduling of all the other regions. One example to show this problem case
can be found at
[PipelinedRegionSchedulingITCase#testRecoverFromPartitionException
|https://github.com/zhuzhurk/flink/commit/1eb036b6566c5cb4958d9957ba84dc78ce62a08c].
To fix the problem, we can add a filter in
{{PipelinedRegionSchedulingStrategy#onExecutionStateChange()}} to only trigger
the scheduling of regions in CREATED state.
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