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From jinxing64 <...@git.apache.org>
Subject [GitHub] spark pull request #18031: Record accurate size of blocks in MapStatus when ...
Date Thu, 18 May 2017 16:09:28 GMT
GitHub user jinxing64 opened a pull request:

    https://github.com/apache/spark/pull/18031

    Record accurate size of blocks in MapStatus when it's above threshold.

    ## What changes were proposed in this pull request?
    
    Currently, when number of reduces is above 2000, HighlyCompressedMapStatus is used to
store size of blocks. in HighlyCompressedMapStatus, only average size is stored for non empty
blocks. Which is not good for memory control when we shuffle blocks. It makes sense to store
the accurate size of block when it's above threshold.
    
    ## How was this patch tested?
    
    Added test in MapStatusSuite.


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/jinxing64/spark SPARK-20801

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/18031.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #18031
    
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