Ayush Saxena created HDFS-15288:
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             Summary: Add Available Space Rack Fault Tolerant BPP
                 Key: HDFS-15288
                 URL: https://issues.apache.org/jira/browse/HDFS-15288
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Ayush Saxena
            Assignee: Ayush Saxena


The Present {{AvailableSpaceBlockPlacementPolicy}} extends the Default Block 
Placement policy, which makes it apt for Replicated files. But not very 
efficient for EC files, which by default use. 
{{BlockPlacementPolicyRackFaultTolerant}}. So propose a to add new BPP having 
similar optimization as ASBPP where as keeping the spread of Blocks to max 
racks, i.e as RackFaultTolerantBPP.

This could extend {{BlockPlacementPolicyRackFaultTolerant}}, rather than the 
{{BlockPlacementPOlicyDefault}} like ASBPP and keep other logics of 
optimization same as ASBPP



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