Details
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Sub-task
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Status: Resolved
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Major
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Resolution: Fixed
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None
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Reviewed
Description
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.