Make it possible for BlockPlacementPolicy to return null
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Key: HDFS-1351
URL: https://issues.apache.org/jira/browse/HDFS-1351
Project: Hadoop HDFS
Issue Type: Test
Components: name-node
Affects Versions: 0.22.0
Reporter: Dmytro Molkov
The idea is to modify FSNamesystem.chooseExcessReplicates code, so it can
accept a null return from chooseReplicaToDelete which will indicate that
NameNode should not be deleting extra replicas.
One possible usecase - if there are nodes being added to the cluster that might
have corrupt replicas on them you do not want to delete other replicas until
the block scanner finished scanning every block on the datanode.
This will require additional work on the implementation of the
BlockPlacementPolicy, but with this JIRA I just wanted to create a basis for
future improvements.
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