Added log messages to debug assignPartitions#951
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hshukla
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Aug 3, 2023
...rver/src/main/java/com/linkedin/datastream/server/assignment/LoadBasedPartitionAssigner.java
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ehoner
previously approved these changes
Aug 4, 2023
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ehoner
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I am approving these in case they are time-sensitive. But in general I agree with @hshukla's comments. I am not convinced these changes will surface the issue(s), but this is a worthwhile first step before considering more involved changes.
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I remember us talking about putting logs around any IO operations that might be happening, should we add some logs there as well?
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The consensus at the end of the meeting was that the assignPartitions method is where the CPU time is spent. I avoided adding logs in other places as to keep unnecessary logging to minimum. |
hshukla
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Aug 4, 2023
shrinandthakkar
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Aug 4, 2023
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We observed that the leader has a tendency to get stuck on this method (in some rare cases for more than 5 minutes). Added log messages to help debug the issue.
Note that the test suite in
TestLoadBasedPartitionAssignerdo not capture such performance problems. Attempts to reproduce them locally didn't work.