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Posted to issues@hbase.apache.org by "Yerui Sun (JIRA)" <ji...@apache.org> on 2015/09/01 13:30:46 UTC
[jira] [Updated] (HBASE-14229) Flushing canceled by coprocessor
still leads to memstoreSize set down
[ https://issues.apache.org/jira/browse/HBASE-14229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yerui Sun updated HBASE-14229:
------------------------------
Attachment: HBASE-14229-0.98-v2.patch
reattach patch for 0.98 branch, for QA run.
> 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: 0.98.13, 1.0.2, 1.2.0, 1.1.1
> Reporter: Yerui Sun
> Attachments: HBASE-14229-0.98-v2.patch, HBASE-14229-0.98.patch, HBASE-14229-branch-1-v2.patch, HBASE-14229-branch-1-v2.patch, HBASE-14229-branch-1.patch
>
>
> 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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