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From "Ted Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4487) The increment operation can release the rowlock before sync-ing the Hlog
Date Thu, 29 Sep 2011 13:38:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13117298#comment-13117298
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Ted Yu commented on HBASE-4487:
-------------------------------

I got the following from test suite run:
{code}
testAppend(org.apache.hadoop.hbase.regionserver.wal.TestHLog)  Time elapsed: 0.037 sec  <<<
ERROR!
java.lang.NullPointerException
        at org.apache.hadoop.hbase.regionserver.wal.TestHLog.testAppend(TestHLog.java:567)
{code}
Please use my script on HBASE-4480 to reproduce the above.
I can provide test output if needed.
                
> The increment operation can release the rowlock before sync-ing the Hlog
> ------------------------------------------------------------------------
>
>                 Key: HBASE-4487
>                 URL: https://issues.apache.org/jira/browse/HBASE-4487
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: appendNoSync4.txt, appendNoSync5.txt
>
>
> This allows for better throughput when there are hot rows.I have seen this change make
a single row update improve from 400 increments/sec/server to 4000 increments/sec/server.

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