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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-604) DataNodes get NullPointerException and become unresponsive on 50010
Date Wed, 08 Nov 2006 01:44:54 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-604?page=all ]

Raghu Angadi updated HADOOP-604:
--------------------------------

    Status: Patch Available  (was: Open)

> DataNodes get NullPointerException and become unresponsive on 50010
> -------------------------------------------------------------------
>
>                 Key: HADOOP-604
>                 URL: http://issues.apache.org/jira/browse/HADOOP-604
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.6.0
>            Reporter: Christian Kunz
>         Assigned To: Raghu Angadi
>         Attachments: fsdataset-locks.patch
>
>
> I wonder whether handling of 'children' in FSDataset is thread-safe.
> Exception in thread "org.apache.hadoop.dfs.DataNode$DataXceiveServer@19b04e2" java.lang.NullPointerException
>         at org.apache.hadoop.dfs.FSDataset$FSDir.checkDirTree(FSDataset.java:162)
>         at org.apache.hadoop.dfs.FSDataset$FSDir.checkDirTree(FSDataset.java:162)
>         at org.apache.hadoop.dfs.FSDataset$FSDir.checkDirTree(FSDataset.java:162)
>         at org.apache.hadoop.dfs.FSDataset$FSDir.checkDirTree(FSDataset.java:162)
>         at org.apache.hadoop.dfs.FSDataset$FSVolume.checkDirs(FSDataset.java:238)
>         at org.apache.hadoop.dfs.FSDataset$FSVolumeSet.checkDirs(FSDataset.java:326)
>         at org.apache.hadoop.dfs.FSDataset.checkDataDir(FSDataset.java:522)
>         at org.apache.hadoop.dfs.DataNode$DataXceiveServer.run(DataNode.java:472)
>         at java.lang.Thread.run(Thread.java:595)

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