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https://issues.apache.org/jira/browse/HBASE-4528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13122540#comment-13122540
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Kannan Muthukkaruppan commented on HBASE-4528:
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Dhruba: You wrote: <<<A single row update improves from 100 puts/sec/server to 
5000 puts/sec/server.>>>.

Can you reconfirm the above? On hbase-89 based test, I am seeing "single row" 
update do ~1000 puts/sec/server.
                
> 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, 
> appendNoSyncPut3.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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