[GitHub] spark pull request #18487: [SPARK-21243][Core] Limit no. of map outputs in a...

[cloud-fan <gi...@git.apache.org>]

Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18487#discussion_r125888006
  
    --- Diff: core/src/main/scala/org/apache/spark/internal/config/package.scala ---
    @@ -321,6 +321,16 @@ package object config {
           .intConf
           .createWithDefault(3)
     
    +  private[spark] val REDUCER_MAX_BLOCKS_IN_FLIGHT_PER_ADDRESS =
    +    ConfigBuilder("spark.reducer.maxBlocksInFlightPerAddress")
    --- End diff --
    
    I'm not sure if it's a good idea to do this at reducer side, because there may be a lot of reducers fetching data from one shuffle service at the same time, and you wouldn't know that at reducer side. cc @jinxing64 


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