deletion of excess replicas does not take into account 'rack-locality'
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Key: HADOOP-1300
URL: https://issues.apache.org/jira/browse/HADOOP-1300
Project: Hadoop
Issue Type: Bug
Reporter: Koji Noguchi
One rack went down today, resulting in one missing block/file.
Looking at the log, this block was originally over-replicated.
3 replicas on one rack and 1 replica on another.
Namenode decided to delete the latter, leaving 3 replicas on the same rack.
It'll be nice if the deletion is also rack-aware.
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