Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/5636#discussion_r35692889
--- Diff: core/src/main/scala/org/apache/spark/scheduler/Stage.scala ---
@@ -76,6 +76,37 @@ private[spark] abstract class Stage(
*/
private var _latestInfo: StageInfo = StageInfo.fromStage(this,
nextAttemptId)
+ /**
+ * Spark is resilient to executors dying by retrying stages on
FetchFailures. Here, we keep track
+ * of unique stage failures (per stage attempt) triggered by fetch
failures to prevent endless
+ * stage retries. Specifically, per stage we wish to only record a
failure when the following
+ * holds:
+ *
+ * A) A fetch failure was observed
+ * B) A failure has not yet been registered for this stage attempt.
There may be multiple
+ * concurrent failures for a sinlge stage since we may have multiple
tasks executing at the same
+ * time, one or many of which may fail. Also, even though there may only
be one non-zombie stage
+ * attemp, zombie stages may still have running tasks.
+ */
+ private val attemptsFailedFromFetch = new HashSet[Int]
+
+ private[scheduler] def clearFailures() : Unit = {
+ attemptsFailedFromFetch.clear()
+ }
+
+ /**
+ * Check whether we should abort the failedStage due to multiple
failures.
+ * This method updates the running set of failures for a particular
stage and returns
+ * true if the number of failures exceeds the allowable number of
failures.
+ */
+ private[scheduler] def failAndShouldAbort(task: Task[_]): Boolean = {
+ // We increment the failure count on the first attempt for a
particular Stage
+ attemptsFailedFromFetch.add(task.stageAttemptId)
+ // Check for multiple FetchFailures in a Stage and for the stage
failing repeatedly following
+ // resubmissions.
+ attemptsFailedFromFetch.size >= Stage.MAX_STAGE_FAILURES
--- End diff --
I think both of these comments inside this method can probably now be
deleted. The first comment isn't accurate any more (we don't count the first
failed attempt of a particular stage, we just count attempts per stage). And I
don't the second one really adds much over the scaladoc.
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