Federation: DatablockScanner should scan blocks for all the block pools.
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Key: HDFS-1655
URL: https://issues.apache.org/jira/browse/HDFS-1655
Project: Hadoop HDFS
Issue Type: New Feature
Affects Versions: Federation Branch
Reporter: Jitendra Nath Pandey
Assignee: Jitendra Nath Pandey
Fix For: Federation Branch
DataBlockScanner changes are needed to work with federation.
Goal is to have DataBlockScanner visit one volume at a time, scanning block
pools under it one at a time.
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