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From "Nigel Daley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-973) NPE in FSDataset during heavy Namenode load
Date Mon, 05 Feb 2007 07:44:05 GMT
NPE in FSDataset during heavy Namenode load
-------------------------------------------

                 Key: HADOOP-973
                 URL: https://issues.apache.org/jira/browse/HADOOP-973
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.11.0
            Reporter: Nigel Daley


Running namenode delete benchmark, I saw many of these NPE's traces in a datanode log:

...
2007-02-04 16:17:53,744 INFO org.apache.hadoop.dfs.DataNode: Deleting block blk_-949112377379974621
2007-02-04 16:17:53,744 INFO org.apache.hadoop.dfs.DataNode: Deleting block blk_748220495971269869
2007-02-04 16:17:54,619 INFO org.apache.hadoop.dfs.DataNode: Deleting block blk_658746956471887871
2007-02-04 16:17:56,752 ERROR org.apache.hadoop.dfs.DataNode: Exception: java.lang.NullPointerException
        at org.apache.hadoop.dfs.FSDataset.invalidate(FSDataset.java:519)
        at org.apache.hadoop.dfs.DataNode.offerService(DataNode.java:410)
        at org.apache.hadoop.dfs.DataNode.run(DataNode.java:1033)
        at java.lang.Thread.run(Thread.java:595)
2007-02-04 16:18:01,754 INFO org.apache.hadoop.dfs.DataNode: using BLOCKREPORT_INTERVAL of
3329089msec
2007-02-04 16:18:02,577 INFO org.apache.hadoop.dfs.DataNode: Deleting block blk_1657305102826276927
2007-02-04 16:18:02,577 INFO org.apache.hadoop.dfs.DataNode: Deleting block blk_589129256174830133
...

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