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https://issues.apache.org/jira/browse/HDFS-4049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13476902#comment-13476902
]
Hudson commented on HDFS-4049:
------------------------------
Integrated in Hadoop-Yarn-trunk #5 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk/5/])
HDFS-4049. Fix hflush performance regression due to nagling delays.
Contributed by Todd Lipcon. (Revision 1398591)
Result = FAILURE
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1398591
Files :
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/PacketReceiver.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestMultiThreadedHflush.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocol/datatransfer
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocol/datatransfer/TestPacketReceiver.java
> hflush performance regression due to nagling delays
> ---------------------------------------------------
>
> Key: HDFS-4049
> URL: https://issues.apache.org/jira/browse/HDFS-4049
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node, performance
> Affects Versions: 3.0.0, 2.0.2-alpha
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 3.0.0, 2.0.3-alpha
>
> Attachments: hdfs-4049.txt, hdfs-4049.txt, hdfs-4049.txt
>
>
> HDFS-3721 reworked the way that packets are mirrored through the pipeline in
> the datanode. This caused two write() calls where there used to be one, which
> interacts badly with nagling so that there are 40ms bubbles on hflush()
> calls. We didn't notice this in the tests because the hflush perf test only
> uses a single datanode.
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