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From mengxr <...@git.apache.org>
Subject [GitHub] incubator-spark pull request: SPARK-1122: allCollect functions for...
Date Tue, 25 Feb 2014 02:42:43 GMT
Github user mengxr commented on the pull request:

    https://github.com/apache/incubator-spark/pull/635#issuecomment-35969142
  
    @JoshRosen I didn't implement this ... AllCollect is better than directly using broadcast
variables if it is implemented without putting heavy load on the driver and data is not very
small. But the current implementation is no better than directly broadcasting variables. A
slightly better solution would be shuffle-based, which does not put load on the driver but
it might create duplicate blocks at the same physical node. The efficient broadcasting you
described sounds interesting, but yes I can imagine it is difficult to implement. Thanks for
sharing your thoughts!


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