Xiao Chen created HDFS-9440:
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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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