wypoon commented on a change in pull request #28848:
URL: https://github.com/apache/spark/pull/28848#discussion_r441678652
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File path: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
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@@ -1939,24 +1941,22 @@ private[spark] class DAGScheduler(
hostToUnregisterOutputs: Option[String],
maybeEpoch: Option[Long] = None): Unit = {
val currentEpoch = maybeEpoch.getOrElse(mapOutputTracker.getEpoch)
+ logDebug(s"Removing executor $execId, fileLost: $fileLost, currentEpoch:
$currentEpoch")
if (!failedEpoch.contains(execId) || failedEpoch(execId) < currentEpoch) {
failedEpoch(execId) = currentEpoch
logInfo("Executor lost: %s (epoch %d)".format(execId, currentEpoch))
blockManagerMaster.removeExecutor(execId)
- if (fileLost) {
- hostToUnregisterOutputs match {
- case Some(host) =>
- logInfo("Shuffle files lost for host: %s (epoch %d)".format(host,
currentEpoch))
- mapOutputTracker.removeOutputsOnHost(host)
- case None =>
- logInfo("Shuffle files lost for executor: %s (epoch
%d)".format(execId, currentEpoch))
- mapOutputTracker.removeOutputsOnExecutor(execId)
- }
- clearCacheLocs()
-
- } else {
- logDebug("Additional executor lost message for %s (epoch
%d)".format(execId, currentEpoch))
+ }
+ if (fileLost && (!fileLostEpoch.contains(execId) || fileLostEpoch(execId)
< currentEpoch)) {
Review comment:
As Attila explained, the purpose of fileLostEpoch is to track if this
code has been called once for that executor and epoch, to avoid repeated calls
to unregister the outputs, since there will usually be multiple fetch failures
causing this method to be called.
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