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From "Dmytro Molkov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1351) Make it possible for BlockPlacementPolicy to return null
Date Tue, 24 Aug 2010 07:25:16 GMT
Make it possible for BlockPlacementPolicy to return null

                 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

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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