Jesse Yates created PHOENIX-871:
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Summary: Mutable Secondary Indexing can cause a deadlock on
exception
Key: PHOENIX-871
URL: https://issues.apache.org/jira/browse/PHOENIX-871
Project: Phoenix
Issue Type: Bug
Affects Versions: 2.2.3, 3.0.0, 4.0.0
Reporter: Jesse Yates
Assignee: Jesse Yates
Fix For: 3.0.0, 4.0.0
We had a regionserver fail to go down on our internal environment. After
digging through the jstacks and logs, it looks like it was because the
INDEX_UPDATE_LOCK was held and never released because, we think, and exception
writing do the WAL, meaning the postXXXX methods never got called.
We then realized that we can remove the lock entirely (and the need for the log
roll synchronization) by performing the write during postBatchMutate. This
avoids an possible hanging locks (from not getting informed of the exception)
but still retains the rest of the index correctness since it is performed under
the updateLock (which will prevent a cache flush or a log roll).
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