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From "Xavier Stevens (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3736) NullPointerException in INode prevent Namenode from starting
Date Wed, 09 Jul 2008 22:31:31 GMT
NullPointerException in INode prevent Namenode from starting
------------------------------------------------------------

                 Key: HADOOP-3736
                 URL: https://issues.apache.org/jira/browse/HADOOP-3736
             Project: Hadoop Core
          Issue Type: Bug
    Affects Versions: 0.16.4
         Environment: CentOS 5, Sun JDK 1.5.0_15
            Reporter: Xavier Stevens


After a headnode went down due to a kernel panic, it was restarted.  When trying to restart
the Hadoop process we encountered the following NullPointerException.  It seems this should
be handled more gracefully allowing the Name Node to come up and function while either deleting
or ignoring the problematic INodes.

2008-07-09 14:30:11,458 INFO org.apache.hadoop.fs.FSNamesystem: isPermissionEnabled=true
2008-07-09 14:30:12,713 ERROR org.apache.hadoop.dfs.NameNode: java.lang.NullPointerException
	at org.apache.hadoop.dfs.INodeDirectory.getExistingPathINodes(INode.java:408)
	at org.apache.hadoop.dfs.INodeDirectory.getNode(INode.java:357)
	at org.apache.hadoop.dfs.INodeDirectory.getNode(INode.java:365)
	at org.apache.hadoop.dfs.FSDirectory.unprotectedDelete(FSDirectory.java:458)
	at org.apache.hadoop.dfs.FSEditLog.loadFSEdits(FSEditLog.java:537)
	at org.apache.hadoop.dfs.FSImage.loadFSEdits(FSImage.java:756)
	at org.apache.hadoop.dfs.FSImage.loadFSImage(FSImage.java:639)
	at org.apache.hadoop.dfs.FSImage.recoverTransitionRead(FSImage.java:222)
	at org.apache.hadoop.dfs.FSDirectory.loadFSImage(FSDirectory.java:79)
	at org.apache.hadoop.dfs.FSNamesystem.initialize(FSNamesystem.java:254)
	at org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:235)
	at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:131)
	at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:176)
	at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:162)
	at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:846)
	at org.apache.hadoop.dfs.NameNode.main(NameNode.java:855)


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