Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/1697#discussion_r15681031
--- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala ---
@@ -284,6 +290,24 @@ private[spark] class MapOutputTrackerMaster(conf:
SparkConf)
cachedSerializedStatuses.contains(shuffleId) ||
mapStatuses.contains(shuffleId)
}
+ // Return the list of locations and blockSizes for each reducer.
+ def getStatusByReducer(shuffleId: Int): Option[Map[Int,
Array[(BlockManagerId, Long)]]] = {
--- End diff --
Added comments -- This method is not thread safe as TimestampedHashMap is
not thread safe. However we only call this from DAGScheduler which is single
threaded AFAIK
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