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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-911) Multithreading issue with libhdfs library
Date Thu, 12 Jul 2007 11:42:09 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12512058
] 

Hudson commented on HADOOP-911:
-------------------------------

Integrated in Hadoop-Nightly #152 (See [http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/152/])

> Multithreading issue with libhdfs library
> -----------------------------------------
>
>                 Key: HADOOP-911
>                 URL: https://issues.apache.org/jira/browse/HADOOP-911
>             Project: Hadoop
>          Issue Type: Bug
>          Components: libhdfs
>    Affects Versions: 0.9.2
>            Reporter: Christian Kunz
>            Assignee: Christian Kunz
>            Priority: Blocker
>             Fix For: 0.14.0
>
>         Attachments: libhdfs.patch
>
>
> Multithreaded applications using libhdfs sometimes run into IllegalMonitorStateException
or plainly lock up (strace shows a thread being in a loop of calling sched_yield). It probably
has to do with the fact that libhdfs does not ensure proper allocation of hashtable entries
that map a threadId to JNI interface pointer.

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