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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 Fri, 28 Oct 2011 02:45:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13137922#comment-13137922
] 

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

>From src/hdfs/org/apache/hadoop/hdfs/DFSClient.java:
{code}
    private void closeThreads() throws IOException {
      try {
        streamer.close();
{code}
Besides closeInternal(), closeThreads() may be called from sync().
Looks like closeThreads() should be made re-entrant.

TRUNK build is broken at the moment.
I will try to reproduce the NPE after TRUNK becomes stable.
                
> 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: 4528-trunk.txt, 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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