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https://issues.apache.org/jira/browse/HBASE-4528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated HBASE-4528:
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Attachment: appendNoSyncPut2.txt
Incorporated most of Ted's comments and all of Lar's comments.
I did not change the order of advancing the rwcc first before releasing the
rowlock in the finally-clause because this will occur only in some error case,
and in that case it might be better to do things in the normal order.
Technically, either way should be fine, but if I am missing something please
let me know and I can change it too.
In TestParallelPut, I did not fold the two loops of thread-creation and
thread-start. The reason being that I would like more concurrency among the
threads, and if I create and start in the same loop then it is likely that by
the a thread starts running, the earlier ones would probably be finished or
advanced significantly, thus reducing the time when all threads are running
concurrently.
> The put operation can release the rowlock before sync-ing the Hlog
> ------------------------------------------------------------------
>
> Key: HBASE-4528
> URL: https://issues.apache.org/jira/browse/HBASE-4528
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: appendNoSyncPut1.txt, appendNoSyncPut2.txt
>
>
> This allows for better throughput when there are hot rows. A single row
> update improves from 100 puts/sec/server to 5000 puts/sec/server.
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