Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/6648#discussion_r33705222
--- Diff:
core/src/main/scala/org/apache/spark/shuffle/hash/HashShuffleManager.scala ---
@@ -50,15 +53,30 @@ private[spark] class HashShuffleManager(conf:
SparkConf) extends ShuffleManager
}
/** Get a writer for a given partition. Called on executors by map
tasks. */
- override def getWriter[K, V](handle: ShuffleHandle, mapId: Int, context:
TaskContext)
- : ShuffleWriter[K, V] = {
- new HashShuffleWriter(
- shuffleBlockResolver, handle.asInstanceOf[BaseShuffleHandle[K, V,
_]], mapId, context)
+ override def getWriter[K, V](
+ handle: ShuffleHandle,
+ mapId: Int,
+ stageAttemptId: Int,
+ context: TaskContext): ShuffleWriter[K, V] = {
+ addShuffleAttempt(handle.shuffleId, stageAttemptId)
+ new HashShuffleWriter(shuffleBlockResolver,
handle.asInstanceOf[BaseShuffleHandle[K, V, _]],
--- End diff --
I added some comments, but I opted against the `getWriterHelper` version
b/c of the delegation inside `UnsafeShuffleManager`. I felt like that added
enough complexity to making sure you didn't double-register shuffles and
cleanup still happened only once in all cases that is out-weighed the benefits.
But its not a clear win either way ... I can finish writing up that version if
you think its worth comparing them both.
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