Junping Du created HDFS-4884:
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Summary: [Umbrella] Block Placement Policy Optimizer
Key: HDFS-4884
URL: https://issues.apache.org/jira/browse/HDFS-4884
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.0.4-alpha, 1.2.0
Reporter: Junping Du
Assignee: Junping Du
The BlockPlacementPolicy (BPP) is extensible and already multiple instances in
system: BlockPlacementPolicyDefault, BlockPlacementPolicyWithNodeGroup,
BlockPlacementPolicyRAID, etc. When cluster is switched from one BPP to another
BPP, HDFS will not check if block locations conform the new BPP. Now, you can
manually fsck on specific directory to identify replica placement policy is
violated for some blocks but have no way to fix it so far. We should provide
way to fix it. Also, in the long term, we should allow multiple BPPs
co-existing on the same HDFS cluster for different purpose of data, i.e. we
should allow some old, infrequently accessed data/directory to under RAID
policy so that can save space.
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