dragon created HDFS-9975:
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Summary: CLONE - Erasure Coding: update the Balancer/Mover data
migration logic
Key: HDFS-9975
URL: https://issues.apache.org/jira/browse/HDFS-9975
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: dragon
Assignee: Walter Su
Fix For: HDFS-7285
Currently the Balancer/Mover only considers the distribution of replicas of the
same block during data migration: the migration cannot decrease the number of
racks. With EC the Balancer and Mover should also take into account the
distribution of blocks belonging to the same block group.
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