pgandhi999 commented on a change in pull request #24035: [SPARK-27112] : Spark
Scheduler encounters two independent Deadlocks …
URL: https://github.com/apache/spark/pull/24035#discussion_r264709208
##########
File path:
core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
##########
@@ -622,67 +633,107 @@ class CoarseGrainedSchedulerBackend(scheduler:
TaskSchedulerImpl, val rpcEnv: Rp
* @param countFailures if there are tasks running on the executors when
they are killed, whether
* those failures be counted to task failure limits?
* @param force whether to force kill busy executors, default false
+ * @param blacklistingOnTaskCompletion whether the executors are being
killed due to
+ * blacklisting triggered by the task
completion event
* @return the ids of the executors acknowledged by the cluster manager to
be removed.
*/
final override def killExecutors(
executorIds: Seq[String],
adjustTargetNumExecutors: Boolean,
countFailures: Boolean,
- force: Boolean): Seq[String] = {
+ force: Boolean,
+ blacklistingOnTaskCompletion: Boolean): Seq[String] = {
logInfo(s"Requesting to kill executor(s) ${executorIds.mkString(", ")}")
- val response = synchronized {
- val (knownExecutors, unknownExecutors) =
executorIds.partition(executorDataMap.contains)
- unknownExecutors.foreach { id =>
- logWarning(s"Executor to kill $id does not exist!")
- }
-
- // If an executor is already pending to be removed, do not kill it again
(SPARK-9795)
- // If this executor is busy, do not kill it unless we are told to force
kill it (SPARK-9552)
- val executorsToKill = knownExecutors
- .filter { id => !executorsPendingToRemove.contains(id) }
- .filter { id => force || !scheduler.isExecutorBusy(id) }
- executorsToKill.foreach { id => executorsPendingToRemove(id) =
!countFailures }
-
- logInfo(s"Actual list of executor(s) to be killed is
${executorsToKill.mkString(", ")}")
-
- // If we do not wish to replace the executors we kill, sync the target
number of executors
- // with the cluster manager to avoid allocating new ones. When computing
the new target,
- // take into account executors that are pending to be added or removed.
- val adjustTotalExecutors =
- if (adjustTargetNumExecutors) {
- requestedTotalExecutors = math.max(requestedTotalExecutors -
executorsToKill.size, 0)
- if (requestedTotalExecutors !=
- (numExistingExecutors + numPendingExecutors -
executorsPendingToRemove.size)) {
- logDebug(
- s"""killExecutors($executorIds, $adjustTargetNumExecutors,
$countFailures, $force):
- |Executor counts do not match:
- |requestedTotalExecutors = $requestedTotalExecutors
- |numExistingExecutors = $numExistingExecutors
- |numPendingExecutors = $numPendingExecutors
- |executorsPendingToRemove =
${executorsPendingToRemove.size}""".stripMargin)
- }
- doRequestTotalExecutors(requestedTotalExecutors)
- } else {
- numPendingExecutors += executorsToKill.size
- Future.successful(true)
+ var response: Future[Seq[String]] = null
+ val idleExecutorIds = executorIds.filter { id =>
!scheduler.isExecutorBusy(id) }
+ if (!blacklistingOnTaskCompletion) {
Review comment:
@attilapiros Believe me, making `executorIdToRunningTaskIds` a TrieMap did
come to my mind and I did give it a shot. It works for our purposes, but we
realized something else. The above map is of type <String, HashSet>. This map
might protect the reference to the HashSet object, however, it gives no
guarantee that the HashSet will not be mutated while accessing the map. It
basically does not guarantee protection on the HashSet. It would have been much
easier to implement the TrieMap had the value of the map would have simply been
an Object and not a collection. I could be wrong here, so if you feel
otherwise, some pointers would be helpful. Thank you.
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