Github user mridulm commented on the pull request:

    https://github.com/apache/spark/pull/1486#issuecomment-56480392
  
    Are we proposing to introduce hdfs caching tags/idioms directly into 
TaskSetManager in this pr ?
    That does not look right. We need to generalize this so that any rdd can 
specify process/host (maybe rack also ?) annotations. 
    Once done, HadoopRdd can leverage that.
    
    Depending on underscore not being in name, etc is fragile.
    One option would be to define our uri's: with default reverting to host 
only.
    



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