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From "Jeremy Carroll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1542) Deadlock in Configuration.writeXml when serialized form is larger than one DFS block
Date Mon, 27 Dec 2010 20:08:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12975324#action_12975324
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Jeremy Carroll commented on HDFS-1542:
--------------------------------------

+1

Just compiled the patch and it looks good to me. Running hadoop-0.20-0.20.2+737. I could not
recreate the issue after the patch.

> 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
>         Attachments: deadlock.txt, hdfs-1542.txt, hdfs1542_cdh3b3.txt, Test.java
>
>
> 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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