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https://issues.apache.org/jira/browse/SPARK-14178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guoqiang Li updated SPARK-14178:
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Summary: DAGScheduler should get map output statuses directly, not by
MapOutputTrackerMaster.getSerializedMapOutputStatuses. (was: Compare
Option[String] and String directly)
> DAGScheduler should get map output statuses directly, not by
> MapOutputTrackerMaster.getSerializedMapOutputStatuses.
> -------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-14178
> URL: https://issues.apache.org/jira/browse/SPARK-14178
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Guoqiang Li
>
> DAGScheduler gets map output statuses by
> {{MapOutputTrackerMaster.getSerializedMapOutputStatuses}}.
> [DAGScheduler.scala#L357 |
> https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#L357]
> {noformat}
> private def newOrUsedShuffleStage(
> shuffleDep: ShuffleDependency[_, _, _],
> firstJobId: Int): ShuffleMapStage = {
> val rdd = shuffleDep.rdd
> val numTasks = rdd.partitions.length
> val stage = newShuffleMapStage(rdd, numTasks, shuffleDep, firstJobId,
> rdd.creationSite)
> if (mapOutputTracker.containsShuffle(shuffleDep.shuffleId)) {
> val serLocs =
> mapOutputTracker.getSerializedMapOutputStatuses(shuffleDep.shuffleId)
> // Deserialization very time consuming.
> val locs = MapOutputTracker.deserializeMapStatuses(serLocs)
> (0 until locs.length).foreach { i =>
> if (locs(i) ne null) {
> // locs(i) will be null if missing
> stage.addOutputLoc(i, locs(i))
> }
> }
> } else {
> // Kind of ugly: need to register RDDs with the cache and map output
> tracker here
> // since we can't do it in the RDD constructor because # of partitions
> is unknown
> logInfo("Registering RDD " + rdd.id + " (" + rdd.getCreationSite + ")")
> mapOutputTracker.registerShuffle(shuffleDep.shuffleId,
> rdd.partitions.length)
> }
> stage
> }
> {noformat}
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