Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/6652#discussion_r31775435
--- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala ---
@@ -284,6 +291,32 @@ private[spark] class MapOutputTrackerMaster(conf:
SparkConf)
cachedSerializedStatuses.contains(shuffleId) ||
mapStatuses.contains(shuffleId)
}
+ // Return the list of locations and blockSizes for each reducer.
+ // The map is keyed by reducerId and for each reducer the value contains
the array
+ // of (location, size) of map outputs.
+ //
+ // This method is not thread-safe
+ def getStatusByReducer(
+ shuffleId: Int,
+ numReducers: Int)
+ : Option[Map[Int, Array[(BlockManagerId, Long)]]] = {
+ if (!statusByReducer.contains(shuffleId) &&
mapStatuses.contains(shuffleId)) {
+ val statuses = mapStatuses(shuffleId)
+ if (statuses.length > 0) {
+ statusByReducer(shuffleId) = new HashMap[Int,
Array[(BlockManagerId, Long)]]
--- End diff --
Great point. I didn't take this into account before. Now added a test in
MapOutputTrackerSuite to test this.
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