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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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