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From mridulm <>
Subject [GitHub] spark pull request #16989: [SPARK-19659] Fetch big blocks to disk when shuff...
Date Tue, 09 May 2017 06:00:52 GMT
Github user mridulm commented on a diff in the pull request:
    --- Diff: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala ---
    @@ -128,41 +130,52 @@ private[spark] class CompressedMapStatus(
      * @param numNonEmptyBlocks the number of non-empty blocks
      * @param emptyBlocks a bitmap tracking which blocks are empty
      * @param avgSize average size of the non-empty blocks
    + * @param hugeBlockSizesArray sizes of huge blocks by their reduceId.
     private[spark] class HighlyCompressedMapStatus private (
         private[this] var loc: BlockManagerId,
         private[this] var numNonEmptyBlocks: Int,
         private[this] var emptyBlocks: RoaringBitmap,
    -    private[this] var avgSize: Long)
    +    private[this] var avgSize: Long,
    +    private[this] var hugeBlockSizesArray: Array[Tuple2[Int, Byte]])
    --- End diff --
    Why does hugeBlockSizesArray exist ? Is it for efficient serializable ?
    If yes, the then converting it into (Array[Int], Array[Byte]) would be better (with each
array written directly - not as Tupe2 object) - more below though.

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