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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-925) Make it harder to accidentally close a shared DFSClient
Date Fri, 04 Feb 2011 17:26:30 GMT

     [ https://issues.apache.org/jira/browse/HDFS-925?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HDFS-925:
--------------------------------

    Attachment: HDFS-925.patch

patch adds a test, checks for the text and the nested exception

> Make it harder to accidentally close a shared DFSClient
> -------------------------------------------------------
>
>                 Key: HDFS-925
>                 URL: https://issues.apache.org/jira/browse/HDFS-925
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>    Affects Versions: 0.21.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>         Attachments: HADOOP-5933.patch, HADOOP-5933.patch, HDFS-925.patch, HDFS-925.patch,
HDFS-925.patch
>
>
> Every so often I get stack traces telling me that DFSClient is closed, usually in {{org.apache.hadoop.hdfs.DFSClient.checkOpen()
}} . The root cause of this is usually that one thread has closed a shared fsclient while
another thread still has a reference to it. If the other thread then asks for a new client
it will get one -and the cache repopulated- but if has one already, then I get to see a stack
trace. 
> It's effectively a race condition between clients in different threads. 

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