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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