Stephan Weinwurm created FLINK-30120:
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Summary: Flink Statefun Task Failure causes restart of all tasks
Key: FLINK-30120
URL: https://issues.apache.org/jira/browse/FLINK-30120
Project: Flink
Issue Type: Improvement
Components: Stateful Functions
Affects Versions: statefun-3.1.1, statefun-3.2.0, statefun-3.0.0
Reporter: Stephan Weinwurm
Hey all,
We've noticed that a single task failure causes all of the Statefun tasks to be
restarted.
For example, a single task fails because of some Statefun Endpoint
unavailability or if one of our Kuberentes TaskManager pods go down.
Flink then determines that the `region` failover strategy requires all tasks to
be restarted so we see this in the logs:
```
Nov 17 10:20:30
org.apache.flink.runtime.executiongraph.failover.flip1.RestartPipelinedRegionFailoverStrategy
[] - Calculating tasks to restart to recover the failed task
31284d56d1e2112b0f20099ee448a6a9_11.
Nov 17 10:20:30
org.apache.flink.runtime.executiongraph.failover.flip1.RestartPipelinedRegionFailoverStrategy
[] - 5650 tasks should be restarted to recover the failed task
31284d56d1e2112b0f20099ee448a6a9_11.
```
Our tasks are all fully independent so I would like that only the one failed
task to get restarted or moved to a different TaskManager slot.
Is there a way to tell Flink to only restart the failed task? Or is there a
specific reason why the region failover strategy decides to restart all tasks?
Thanks in advance!
Stephan
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