NPE in Datanode

Thu, 28 Jan 2010 14:38:08 -0800 

Hi All,

I got an NPE on hadoop-18.1 datanode

Exception in thread "org.apache.hadoop.dfs.datanod...@107f7f7"
java.lang.NullPointerException
        at org.apache.hadoop.dfs.FSDataset.getMetaFile(FSDataset.java:571)
        at org.apache.hadoop.dfs.FSDataset.updateBlock(FSDataset.java:801)
        at org.apache.hadoop.dfs.DataNode.updateBlock(DataNode.java:3108)
        at
org.apache.hadoop.dfs.LeaseManager.syncBlock(LeaseManager.java:503)
        at
org.apache.hadoop.dfs.LeaseManager.recoverBlock(LeaseManager.java:471)
        at
org.apache.hadoop.dfs.LeaseManager.recoverBlocks(LeaseManager.java:412)
        at org.apache.hadoop.dfs.DataNode$1.run(DataNode.java:3098)
        at java.lang.Thread.run(Thread.java:619)

Pl advise how do I debug this problem


-Sagar

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