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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1542) Deadlock in Configuration.writeXml when serialized form is larger than one DFS block
Date Wed, 20 Apr 2011 23:33:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13022453#comment-13022453
] 

Hudson commented on HDFS-1542:
------------------------------

Integrated in Hadoop-Hdfs-trunk #643 (See [https://builds.apache.org/hudson/job/Hadoop-Hdfs-trunk/643/])
    

> Deadlock in Configuration.writeXml when serialized form is larger than one DFS block
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-1542
>                 URL: https://issues.apache.org/jira/browse/HDFS-1542
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.22.0, 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.22.0
>
>         Attachments: Test.java, deadlock.txt, hdfs-1542.txt, hdfs-1542.txt, hdfs-1542.txt,
hdfs-1542.txt, hdfs1542_cdh3b3.txt
>
>
> Configuration.writeXml holds a lock on itself and then writes the XML to an output stream,
during which DFSOutputStream will try to get a lock on ackQueue/dataQueue. Meanwihle the DataStreamer
thread will call functions like conf.getInt() and deadlock against the other thread, since
it could be the same conf object.
> This causes a deterministic deadlock whenever the serialized form is larger than block
size.

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