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From "sunyerui (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14229) Flushing canceled by coprocessor still leads to memstoreSize set down
Date Mon, 17 Aug 2015 04:23:46 GMT
sunyerui created HBASE-14229:
--------------------------------

             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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