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From "Ted Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4528) The put operation can release the rowlock before sync-ing the Hlog
Date Thu, 27 Oct 2011 21:20:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13137565#comment-13137565
] 

Ted Yu commented on HBASE-4528:
-------------------------------

I found no log statements in any of the rollback methods.
I think at least we should add one LOG statement at the beginning of rollbackMemstore(), such
as:
{code}
    LOG.debug("rollbackMemstore start:" + start + " end:" + end);
{code}
                
> 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
>             Fix For: 0.94.0
>
>         Attachments: HBASE-4528-Trunk-FINAL.patch, appendNoSync5.txt, appendNoSyncPut1.txt,
appendNoSyncPut2.txt, appendNoSyncPut3.txt, appendNoSyncPut4.txt, appendNoSyncPut5.txt, appendNoSyncPut6.txt,
appendNoSyncPut7.txt, appendNoSyncPut8.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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