If multiple hosts for a split belong to the same rack, the rack is added
multiple times in the AM request table
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Key: MAPREDUCE-3834
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3834
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2
Affects Versions: 0.23.0
Reporter: Siddharth Seth
Priority: Critical
Should be added only once - so that the RM doesn't think there's multiple rack
local requests for that particular rack.
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