Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/1328#discussion_r15268635
--- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala ---
@@ -340,6 +459,7 @@ private[spark] class MapOutputTrackerMaster(conf:
SparkConf)
*/
private[spark] class MapOutputTrackerWorker(conf: SparkConf) extends
MapOutputTracker(conf) {
protected val mapStatuses = new HashMap[Int, Array[MapStatus]]
+ with mutable.SynchronizedMap[Int, Array[MapStatus]]
--- End diff --
> Maybe it's better to make it ConcurrentHashMap in the base class.
Because MapOutputTrackerMaster uses TimeStampedHashMap which is not a
ConcurrentHashMap, MapOutputTracker still needs to use Map. Nevertheless, I can
add a comment on MapOutputTracker.mapStatuses to mark that it should be a
thread-safe map.
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