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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6529) Trace logging for RemoteBlockReader2 to identify remote datanode and file being read
Date Sat, 14 Jun 2014 01:08:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14031382#comment-14031382
] 

Hudson commented on HDFS-6529:
------------------------------

SUCCESS: Integrated in Hadoop-trunk-Commit #5705 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/5705/])
HDFS-6529. Trace logging for RemoteBlockReader2 to identify remote datanode and file being
read. Contributed by Anubhav Dhoot. (atm: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1602538)
* /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/RemoteBlockReader2.java


> Trace logging for RemoteBlockReader2 to identify remote datanode and file being read
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-6529
>                 URL: https://issues.apache.org/jira/browse/HDFS-6529
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>    Affects Versions: 2.4.0
>            Reporter: Anubhav Dhoot
>            Assignee: Anubhav Dhoot
>            Priority: Minor
>             Fix For: 2.5.0
>
>         Attachments: HDFS-6529.patch
>
>
> The scenario is some download is stuck and we dont know which data node is the client
waiting and for which path.
> By turning this file trace logging we will get a running trace of which requests have
started and which have completed.
> If trace is not enabled, there is no overhead other than checking if trace is enabled



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