Ming Ma created HDFS-9007:
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Summary: Fix HDFS Balancer to honor upgrade domain policy
Key: HDFS-9007
URL: https://issues.apache.org/jira/browse/HDFS-9007
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Ming Ma
In the current design of HDFS Balancer, it doesn't use BlockPlacementPolicy
used by namenode runtime. Instead, it has somewhat redundant code to make sure
block allocation conforms with the rack policy.
When namenode uses upgrade domain based policy, we need to make sure that HDFS
balancer doesn't move blocks in a way that could violate upgrade domain block
placement policy.
In the longer term, we should consider how to make Balancer independent of the
actual BlockPlacementPolicy as in HDFS-1431.
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