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https://issues.apache.org/jira/browse/HBASE-10344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13872750#comment-13872750
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Hudson commented on HBASE-10344:
--------------------------------
FAILURE: Integrated in HBase-0.98 #85 (See
[https://builds.apache.org/job/HBase-0.98/85/])
HBASE-10344 Improve write performance by ignoring sync to hdfs when an
asyncer's writes have been synced by other asyncer (Tedyu: rev 1558505)
*
/hbase/branches/0.98/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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