From 6592a6058eee6a27a5c91281ca19076284d62483 Mon Sep 17 00:00:00 2001 From: Grace Date: Tue, 21 Jul 2015 11:35:49 -0500 Subject: [PATCH] [SPARK-9193] Avoid assigning tasks to "lost" executor(s) Now, when some executors are killed by dynamic-allocation, it leads to some mis-assignment onto lost executors sometimes. Such kind of mis-assignment causes task failure(s) or even job failure if it repeats that errors for 4 times. The root cause is that ***killExecutors*** doesn't remove those executors under killing ASAP. It depends on the ***OnDisassociated*** event to refresh the active working list later. The delay time really depends on your cluster status (from several milliseconds to sub-minute). When new tasks to be scheduled during that period of time, it will be assigned to those "active" but "under killing" executors. Then the tasks will be failed due to "executor lost". The better way is to exclude those executors under killing in the makeOffers(). Then all those tasks won't be allocated onto those executors "to be lost" any more. Author: Grace Closes #7528 from GraceH/AssignToLostExecutor and squashes the following commits: ecc1da6 [Grace] scala style fix 6e2ed96 [Grace] Re-word makeOffers by more readable lines b5546ce [Grace] Add comments about the fix 30a9ad0 [Grace] Avoid assigning tasks to lost executors --- .../cluster/CoarseGrainedSchedulerBackend.scala | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala b/core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala index f14c603ac6891..c65b3e517773e 100644 --- a/core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala +++ b/core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala @@ -169,9 +169,12 @@ class CoarseGrainedSchedulerBackend(scheduler: TaskSchedulerImpl, val rpcEnv: Rp // Make fake resource offers on all executors private def makeOffers() { - launchTasks(scheduler.resourceOffers(executorDataMap.map { case (id, executorData) => + // Filter out executors under killing + val activeExecutors = executorDataMap.filterKeys(!executorsPendingToRemove.contains(_)) + val workOffers = activeExecutors.map { case (id, executorData) => new WorkerOffer(id, executorData.executorHost, executorData.freeCores) - }.toSeq)) + }.toSeq + launchTasks(scheduler.resourceOffers(workOffers)) } override def onDisconnected(remoteAddress: RpcAddress): Unit = { @@ -181,9 +184,13 @@ class CoarseGrainedSchedulerBackend(scheduler: TaskSchedulerImpl, val rpcEnv: Rp // Make fake resource offers on just one executor private def makeOffers(executorId: String) { - val executorData = executorDataMap(executorId) - launchTasks(scheduler.resourceOffers( - Seq(new WorkerOffer(executorId, executorData.executorHost, executorData.freeCores)))) + // Filter out executors under killing + if (!executorsPendingToRemove.contains(executorId)) { + val executorData = executorDataMap(executorId) + val workOffers = Seq( + new WorkerOffer(executorId, executorData.executorHost, executorData.freeCores)) + launchTasks(scheduler.resourceOffers(workOffers)) + } } // Launch tasks returned by a set of resource offers