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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-911) Multithreading issue with libhdfs library
Date Tue, 10 Jul 2007 02:08:04 GMT

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

Christian Kunz updated HADOOP-911:
----------------------------------

    Attachment: libhdfs.patch

I attached the patch.

> 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
>            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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