Nico Kruber created FLINK-20886:
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Summary: Add the option to get a threaddump on checkpoint timeouts
Key: FLINK-20886
URL: https://issues.apache.org/jira/browse/FLINK-20886
Project: Flink
Issue Type: Improvement
Components: Runtime / Checkpointing
Affects Versions: 1.12.0
Reporter: Nico Kruber
For debugging checkpoint timeouts, I was thinking about the following addition
to Flink:
When a checkpoint times out and the async thread is still running, create a
threaddump [1] and either add this to the checkpoint stats, log it, or write it
out.
This may help identifying where the checkpoint is stuck (maybe a lock, could
also be in a third party lib like the FS connectors,...). It would give us some
insights into what the thread is currently doing.
Limiting the scope of the threads would be nice but may not be possible in the
general case since additional threads (spawned by the FS connector lib, or
otherwise connected) may interact with the async thread(s) by e.g. going
through the same locks.
[1] https://crunchify.com/how-to-generate-java-thread-dump-programmatically/
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