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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3343) Improve metrics for DN read latency
Date Wed, 04 Jul 2012 20:47:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406744#comment-13406744

Hudson commented on HDFS-3343:

Integrated in Hadoop-Mapreduce-trunk-Commit #2439 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/2439/])
    HDFS-3343. Improve metrics for DN read latency. Contributed by Andrew Wang. (Revision

     Result = FAILURE
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1356928
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/SocketOutputStream.java
* /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/server/datanode/BlockSender.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/metrics/DataNodeMetrics.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeMetrics.java

> Improve metrics for DN read latency
> -----------------------------------
>                 Key: HDFS-3343
>                 URL: https://issues.apache.org/jira/browse/HDFS-3343
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>            Reporter: Todd Lipcon
>            Assignee: Andrew Wang
>             Fix For: 2.0.1-alpha
>         Attachments: hdfs-3343-2.patch, hdfs-3343-3.patch, hdfs-3343-4.patch, hdfs-3343.patch
> Similar to HDFS-3170 on the write side, we should improve the metrics that are generated
on the DN for read latency. We should have separate metrics for the time spent in {{transferTo}}
vs {{waitWritable}} so that it's easy to distinguish slow local disks from slow readers on
the other end of the socket.

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