NPE in 
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                 Key: HDFS-676
                 URL: https://issues.apache.org/jira/browse/HDFS-676
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Tsz Wo (Nicholas), SZE


java.io.IOException: java.lang.NullPointerException
        at 
org.apache.hadoop.hdfs.server.datanode.FSDataset.updateReplicaUnderRecovery(FSDataset.java:2089)
        at 
org.apache.hadoop.hdfs.server.datanode.DataNode.updateReplicaUnderRecovery(DataNode.java:1598)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:516)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:964)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:960)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:958)


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