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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9440) Improve BlockPlacementPolicyDefault's to be able to rebalance when picking of excess replicas
Date Thu, 19 Nov 2015 01:29:11 GMT
Xiao Chen created HDFS-9440:
-------------------------------

             Summary: Improve BlockPlacementPolicyDefault's to be able to rebalance when picking
of excess replicas
                 Key: HDFS-9440
                 URL: https://issues.apache.org/jira/browse/HDFS-9440
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Xiao Chen


The test case used in HDFS-9313 and HDFS-9314 identified the limitation of excess replica
picking. If the current replicas are on
{SSD(rack 1), DISK(rack 3), DISK(rack 3), DISK(rack 3)}
and the storage policy changes to HOT_STORAGE_POLICY_ID, BlockPlacementPolicyDefault's won't
be able to delete SSD replica, because deleting the SSD on rack 1 will violate the block placement
policy.



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