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From "Jiandan Yang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12638) NameNode exit due to NPE
Date Wed, 11 Oct 2017 11:30:00 GMT
Jiandan Yang  created HDFS-12638:
------------------------------------

             Summary: NameNode exit due to NPE
                 Key: HDFS-12638
                 URL: https://issues.apache.org/jira/browse/HDFS-12638
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs
    Affects Versions: 2.8.2
            Reporter: Jiandan Yang 


Active NamNode exit due to NPE, and I think BlockCollection 'bc' is Null by exclusion, but
I do not know why bc is Null, By view history I guess this issue may be involved by [HDFS-9754|https://issues.apache.org/jira/browse/HDFS-9754].


NN logs are as following:
{code:java}
2017-10-11 16:29:06,161 ERROR [ReplicationMonitor] org.apache.hadoop.hdfs.server.blockmanagement.BlockManager:
ReplicationMonitor thread received Runtime exception.
java.lang.NullPointerException
        at org.apache.hadoop.hdfs.server.blockmanagement.ReplicationWork.chooseTargets(ReplicationWork.java:55)
        at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWorkForBlocks(BlockManager.java:1532)
        at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeReplicationWork(BlockManager.java:1491)
        at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:3792)
        at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:3744)
        at java.lang.Thread.run(Thread.java:834)
{code}



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