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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10344) Improve write performance by ignoring sync to hdfs when an asyncer's writes have been synced by other asyncer
Date Thu, 16 Jan 2014 01:36:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13872928#comment-13872928
] 

Hudson commented on HBASE-10344:
--------------------------------

SUCCESS: Integrated in HBase-TRUNK-on-Hadoop-1.1 #54 (See [https://builds.apache.org/job/HBase-TRUNK-on-Hadoop-1.1/54/])
HBASE-10344 Improve write performance by ignoring sync to hdfs when an asyncer's writes have
been synced by other asyncer (Tedyu: rev 1558506)
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java


> Improve write performance by ignoring sync to hdfs when an asyncer's writes have been
synced by other asyncer
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-10344
>                 URL: https://issues.apache.org/jira/browse/HBASE-10344
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Feng Honghua
>            Assignee: Feng Honghua
>             Fix For: 0.98.0, 0.99.0
>
>         Attachments: HBASE-10344-trunk_v0.patch
>
>
> By fixing [HBASE-10329|https://issues.apache.org/jira/browse/HBASE-10329], we know it's
possible an asyncer's writes could have been synced by other asyncer before it starts to do
the sync. We distinguish this case and handle accordingly when writer is null, but only for
when writer is null.
> When writer is not null(the much more typical case), we also can check and ignore the
sync if asyncer's writes have been synced by other asyncer before doing sync. Since sync is
a quite heavy operation(together with the following notifying notifier thread and log roll
check) we can have some performance gain by ignoring it for such case.



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