Ming Ma created HDFS-9314:
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Summary: Improve BlockPlacementPolicyDefault's picking of excess
replicas
Key: HDFS-9314
URL: https://issues.apache.org/jira/browse/HDFS-9314
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Ming Ma
The test case used in HDFS-9313 identified NullPointerException as well as the
limitation of excess replica picking. If the current replicas are on {SSD(rack
r1), DISK(rack 1), DISK(rack 2), DISK(rack 2)} and the storage policy changes
to HOT_STORAGE_POLICY_ID, BlockPlacementPolicyDefault's won't be able to delete
SSD replica.
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