[jira] [Created] (MAPREDUCE-3255) MR2 needs a counter analogous to "slot seconds"

["Todd Lipcon (Created) (JIRA)" <ji...@apache.org>]

MR2 needs a counter analogous to "slot seconds"
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                 Key: MAPREDUCE-3255
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3255
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: mrv2
    Affects Versions: 0.23.0
            Reporter: Todd Lipcon


In older versions of MR, we have a SLOT_MILLIS counter which counts how many seconds each task (and job) used of map/reduce slots. Since we no longer have the concept of a "slot" in MR2, we should change this counter to be something like "RAM-megabyte-seconds" - ie each task is charged for its resource requirement * the number of seconds it occupied those resources.

Ideally these would be collected by the NodeManager rather than the children, so that they could be used for billing purposes, but a first cut of the counters through the MR framework itself would probably still be useful in more trusting environments.

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