[HADOOP-604] DataNodes get NullPointerException and become unresponsive on 50010

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.6.0
• Fix Version/s: 0.9.0
• Assignee: Raghu Angadi
• Reporter: Christian Kunz
• Created: 16/Oct/06 17:49
• Updated: 08/Jul/09 16:42
• Resolved: 08/Nov/06 23:00

Description

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)