[GitHub] spark pull request: [SPARK-6321] [SQL] Adapt the number of partiti...

[marmbrus <gi...@git.apache.org>]

Github user marmbrus commented on the pull request:

    https://github.com/apache/spark/pull/5013#issuecomment-89094687
  
    Hey @ojkar, thanks for working on this.  I'd love to have better support for automatically setting the numbers of partitions.  However, I'm hesitant to do it based on cluster size.  Specifically, I'm worried that existing jobs that run on a small cluster, but with lots of data, might start OOMing where they did not before.  Instead, I think this needs to be controlled by a conf (perhaps when `spark.sql.shuffle.partitions` is set to `auto`), and have it based on the # of input partitions.  What do you think?


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