Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/1542#discussion_r15326142
--- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala ---
@@ -130,7 +130,7 @@ private[spark] abstract class MapOutputTracker(conf:
SparkConf) extends Logging
if (statuses == null) {
logInfo("Don't have map outputs for shuffle " + shuffleId + ",
fetching them")
var fetchedStatuses: Array[MapStatus] = null
- fetching.synchronized {
+ shuffleId.toString.intern.synchronized {
--- End diff --
In addition, using the monitor of an object from outside to `synchronized`
makes it hard to analyse the codes because the monitor of this object may be
used (or used in the future) in other place and the developer may not notice
somebody has already used it here.
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