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https://issues.apache.org/jira/browse/HDFS-3280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13253948#comment-13253948
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Hadoop QA commented on HDFS-3280:
---------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12522653/hdfs-3280.txt
against trunk revision .
+1 @author. The patch does not contain any @author tags.
-1 tests included. The patch doesn't appear to include any new or modified
tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
-1 patch. The patch command could not apply the patch.
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/2277//console
This message is automatically generated.
> DFSOutputStream.sync should not be synchronized
> -----------------------------------------------
>
> Key: HDFS-3280
> URL: https://issues.apache.org/jira/browse/HDFS-3280
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs client
> Affects Versions: 2.0.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Attachments: hdfs-3280.txt
>
>
> HDFS-895 added an optimization to make hflush() much faster by
> unsynchronizing it. But, we forgot to un-synchronize the deprecated
> {{sync()}} wrapper method. This makes the HBase WAL really slow on 0.23+
> since it doesn't take advantage of HDFS-895 anymore.
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