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Posted to hdfs-dev@hadoop.apache.org by "Takuya Fukudome (JIRA)" <ji...@apache.org> on 2015/07/28 04:55:04 UTC

[jira] [Created] (HDFS-8827) Erasure Coding: When namenode processes over replicated striped block, NPE will be occur in ReplicationMonitor

Takuya Fukudome created HDFS-8827:
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             Summary: Erasure Coding: When namenode processes over replicated striped block, NPE will be occur in ReplicationMonitor
                 Key: HDFS-8827
                 URL: https://issues.apache.org/jira/browse/HDFS-8827
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Takuya Fukudome
            Assignee: Takuya Fukudome


In our test cluster, when namenode processed over replicated striped blocks, null pointer exception(NPE) occurred. This happened under below situation: 1) some datanodes shutdown. 2) namenode recovers block group which lost internal blocks. 3) restart the stopped datanodes. 4) namenode processes over replicated striped blocks. 5) NPE occurs
I think BlockPlacementPolicyDefault#chooseReplicaToDelete will return null in this situation which causes this NPE problem.



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