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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6466) Enable multi-thread for memstore flush
Date Fri, 27 Jul 2012 18:25:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424037#comment-13424037

Jean-Daniel Cryans commented on HBASE-6466:

How does this relate to HBASE-2832? It's a shame the patch of there was lost tho. Jon Gray
might still have it somewhere.

Also if this patch doesn't modify the behavior of {{HLog.startCacheFlush}} and {{HLog.completeCacheFlush}}
WRT the {{cacheFlushLock}} I can't see how it could make things any faster. In fact, it's
even worse since the other flushing thread acquire a write lock just before getting the flush
lock (meaning that while one thread flushes, the others are blocking the inserts and not flushing).
> Enable multi-thread for memstore flush
> --------------------------------------
>                 Key: HBASE-6466
>                 URL: https://issues.apache.org/jira/browse/HBASE-6466
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>         Attachments: HBASE-6466.patch, HBASE-6466v2.patch
> If the KV is large or Hlog is closed with high-pressure putting, we found memstore is
often above the high water mark and block the putting.
> So should we enable multi-thread for Memstore Flush?

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