sunyerui created HBASE-14229:
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Summary: Flushing canceled by coprocessor still leads to
memstoreSize set down
Key: HBASE-14229
URL: https://issues.apache.org/jira/browse/HBASE-14229
Project: HBase
Issue Type: Bug
Components: regionserver
Affects Versions: 1.1.1, 0.98.13, 1.0.2, 1.2.0
Reporter: sunyerui
A Coprocessor override "public InternalScanner preFlush(final Store store,
final InternalScanner scanner)" and return NULL when calling this method, will
cancel flush request, leaving snapshot un-flushed, and no new storefile
created. But the HRegion.internalFlushCache still set down memstoreSize to 0 by
totalFlushableSize.
If there's no write requests anymore, the memstoreSize will remaining as 0, and
no more flush quests will be processed because of the checking of
memstoreSize.get() <=0 at the beginning of internalFlushCache.
This issue may not cause data loss, but it will confuse coprocessor users. If
we argree with this, I'll apply a patch later.
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