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From "ramkrishna.s.vasudevan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4487) The increment operation can release the rowlock before sync-ing the Hlog
Date Fri, 30 Sep 2011 16:34:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13118177#comment-13118177
] 

ramkrishna.s.vasudevan commented on HBASE-4487:
-----------------------------------------------

{code}
-    synchronized (this.updateLock) {
-      if (this.closed) {
-        return;
-      }
+    syncer(this.unflushedEntries.get()); // sync all pending items
{code}

The patch shows that the above 'if' check is been removed.  So it is 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
>             Fix For: 0.94.0
>
>         Attachments: appendNoSync4.txt, appendNoSync5.txt, appendNoSync6.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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