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Date: Tue, 26 Jan 2010 13:32:34 +0000 (UTC)
From: "Steve Loughran (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Moved: (HDFS-925) Make it harder to accidentally close a
 shared DFSClient
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     [ https://issues.apache.org/jira/browse/HDFS-925?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran moved HADOOP-5933 to HDFS-925:
---------------------------------------------

          Component/s:     (was: fs)
                       hdfs client
        Fix Version/s:     (was: 0.22.0)
                       0.22.0
    Affects Version/s:     (was: 0.21.0)
                       0.21.0
                  Key: HDFS-925  (was: HADOOP-5933)
              Project: Hadoop HDFS  (was: Hadoop Common)

> 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
>            Priority: Minor
>             Fix For: 0.22.0
>
>         Attachments: HADOOP-5933.patch, HADOOP-5933.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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