Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/12113#discussion_r62115577
--- Diff: core/src/main/scala/org/apache/spark/MapOutputTracker.scala ---
@@ -428,40 +503,89 @@ private[spark] class MapOutputTrackerMaster(conf:
SparkConf)
}
}
+ private def removeBroadcast(bcast: Broadcast[_]): Unit = {
+ if (null != bcast) {
+ broadcastManager.unbroadcast(bcast.id,
+ removeFromDriver = true, blocking = false)
+ }
+ }
+
+ private def clearCachedBroadcast(): Unit = {
+ for (cached <- cachedSerializedBroadcast) removeBroadcast(cached._2)
+ cachedSerializedBroadcast.clear()
+ }
+
def getSerializedMapOutputStatuses(shuffleId: Int): Array[Byte] = {
var statuses: Array[MapStatus] = null
+ var retBytes: Array[Byte] = null
var epochGotten: Long = -1
- epochLock.synchronized {
- if (epoch > cacheEpoch) {
- cachedSerializedStatuses.clear()
- cacheEpoch = epoch
- }
- cachedSerializedStatuses.get(shuffleId) match {
- case Some(bytes) =>
- return bytes
- case None =>
- statuses = mapStatuses.getOrElse(shuffleId, Array[MapStatus]())
- epochGotten = epoch
+
+ // Check to see if we have a cached version, returns true if it does
+ // and has side effect of setting retBytes. If not returns false
+ // with side effect of setting statuses
+ def checkCachedStatuses(): Boolean = {
+ epochLock.synchronized {
+ if (epoch > cacheEpoch) {
--- End diff --
If anything changes with map output. For instances lose an executor or you
get enough fetch failures for a map output. The map output status' in cache
are no longer valid then.
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