Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/6652#discussion_r31765446
--- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala ---
@@ -232,6 +232,12 @@ private[spark] class MapOutputTrackerMaster(conf:
SparkConf)
protected val mapStatuses = new TimeStampedHashMap[Int,
Array[MapStatus]]()
private val cachedSerializedStatuses = new TimeStampedHashMap[Int,
Array[Byte]]()
+ // For each shuffleId we also maintain a Map from reducerId ->
(location, size)
+ // Lazily populated whenever the statuses are requested from DAGScheduler
+ private val statusByReducer =
--- End diff --
nit: could you rename this to shuffleIdToReduceLocations? With the current
name, I expected the main map to be keyed on reduce id.
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