Ngone51 commented on a change in pull request #27604:
[SPARK-30849][CORE][SHUFFLE]Fix application failed due to failed to get
MapStatuses broadcast block
URL: https://github.com/apache/spark/pull/27604#discussion_r390191608
##########
File path: core/src/main/scala/org/apache/spark/MapOutputTracker.scala
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@@ -851,8 +852,16 @@ private[spark] class MapOutputTrackerWorker(conf:
SparkConf) extends MapOutputTr
var fetchedStatuses = mapStatuses.get(shuffleId).orNull
if (fetchedStatuses == null) {
logInfo("Doing the fetch; tracker endpoint = " + trackerEndpoint)
- val fetchedBytes =
askTracker[Array[Byte]](GetMapOutputStatuses(shuffleId))
- fetchedStatuses =
MapOutputTracker.deserializeMapStatuses(fetchedBytes, conf)
+ try {
+ val fetchedBytes =
askTracker[Array[Byte]](GetMapOutputStatuses(shuffleId))
+ fetchedStatuses =
MapOutputTracker.deserializeMapStatuses(fetchedBytes, conf)
+ } catch {
+ case e: IOException if
+
Throwables.getCausalChain(e).asScala.exists(_.isInstanceOf[BlockNotFoundException])
=>
+ mapStatuses.clear()
Review comment:
I think there's a potential assuming that *shuffle data are aways randomly
and evenly placed on nodes*. That means, any shuffle fetch failure can imply
the potential fetch failure for other shuffles in future. So, currently, we
aways clear `mapStatuses` when fetch failure happens.
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