[ http://issues.apache.org/jira/browse/HADOOP-604?page=all ]
Raghu Angadi updated HADOOP-604:
--------------------------------
Attachment: fsdataset-locks.patch
This patch fixes the NPE and synchronizes datanode's directories and maps.
> 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 "[EMAIL PROTECTED]" 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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