[jira] Commented: (HADOOP-911) Multithreading issue with libhdfs library

["Arun C Murthy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12511507 ] 

Arun C Murthy commented on HADOOP-911:
--------------------------------------

+1

> 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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