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https://issues.apache.org/jira/browse/HDFS-121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE resolved HDFS-121.
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Resolution: Not A Problem
Closing. Please feel free to reopen if this is still a problem.
> NullPointerException in INode prevent Namenode from starting
> ------------------------------------------------------------
>
> Key: HDFS-121
> URL: https://issues.apache.org/jira/browse/HDFS-121
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> 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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