Peter Bacsko created YARN-9552:
----------------------------------
Summary: FairScheduler: NODE_UPDATE can cause a
NoSuchElementException
Key: YARN-9552
URL: https://issues.apache.org/jira/browse/YARN-9552
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Reporter: Peter Bacsko
Assignee: Peter Bacsko
We observed a race condition inside YARN with the following stack trace:
{noformat}
18/11/07 06:45:09.559 SchedulerEventDispatcher:Event Processor ERROR
EventDispatcher: Error in handling event type NODE_UPDATE to the Event
Dispatcher
java.util.NoSuchElementException
at
java.util.concurrent.ConcurrentSkipListMap.firstKey(ConcurrentSkipListMap.java:2036)
at
java.util.concurrent.ConcurrentSkipListSet.first(ConcurrentSkipListSet.java:396)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.AppSchedulingInfo.getNextPendingAsk(AppSchedulingInfo.java:373)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSAppAttempt.isOverAMShareLimit(FSAppAttempt.java:941)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSAppAttempt.assignContainer(FSAppAttempt.java:1373)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSLeafQueue.assignContainer(FSLeafQueue.java:353)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSParentQueue.assignContainer(FSParentQueue.java:204)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.attemptScheduling(FairScheduler.java:1094)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.nodeUpdate(FairScheduler.java:961)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:1183)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:132)
at
org.apache.hadoop.yarn.event.EventDispatcher$EventProcessor.run(EventDispatcher.java:66)
at java.lang.Thread.run(Thread.java:748)
{noformat}
This is basically the same as the one described in YARN-7382, but the root
cause is different.
When we create an application attempt, we create an {{FSAppAttempt}} object.
This contains an {{AppSchedulingInfo}} which contains a set of
{{SchedulerRequestKey}}. Initially, this set is empty and only initialized a
bit later on a separate thread during a state transition:
{noformat}
2019-05-07 15:58:02,659 INFO [RM StateStore dispatcher] recovery.RMStateStore
(RMStateStore.java:transition(239)) - Storing info for app:
application_1557237478804_0001
2019-05-07 15:58:02,684 INFO [RM Event dispatcher] rmapp.RMAppImpl
(RMAppImpl.java:handle(903)) - application_1557237478804_0001 State change from
NEW_SAVING to SUBMITTED on event = APP_NEW_SAVED
2019-05-07 15:58:02,690 INFO [SchedulerEventDispatcher:Event Processor]
fair.FairScheduler (FairScheduler.java:addApplication(490)) - Accepted
application application_1557237478804_0001 from user: bacskop, in queue:
root.bacskop, currently num of applications: 1
2019-05-07 15:58:02,698 INFO [RM Event dispatcher] rmapp.RMAppImpl
(RMAppImpl.java:handle(903)) - application_1557237478804_0001 State change from
SUBMITTED to ACCEPTED on event = APP_ACCEPTED
2019-05-07 15:58:02,731 INFO [RM Event dispatcher]
resourcemanager.ApplicationMasterService
(ApplicationMasterService.java:registerAppAttempt(434)) - Registering app
attempt : appattempt_1557237478804_0001_000001
2019-05-07 15:58:02,732 INFO [RM Event dispatcher] attempt.RMAppAttemptImpl
(RMAppAttemptImpl.java:handle(920)) - appattempt_1557237478804_0001_000001
State change from NEW to SUBMITTED on event = START
2019-05-07 15:58:02,746 INFO [SchedulerEventDispatcher:Event Processor]
scheduler.SchedulerApplicationAttempt
(SchedulerApplicationAttempt.java:<init>(207)) - *** In the constructor of
SchedulerApplicationAttempt
2019-05-07 15:58:02,747 INFO [SchedulerEventDispatcher:Event Processor]
scheduler.SchedulerApplicationAttempt
(SchedulerApplicationAttempt.java:<init>(230)) - *** Contents of
appSchedulingInfo: []
2019-05-07 15:58:02,752 INFO [SchedulerEventDispatcher:Event Processor]
fair.FairScheduler (FairScheduler.java:addApplicationAttempt(546)) - Added
Application Attempt appattempt_1557237478804_0001_000001 to scheduler from
user: bacskop
2019-05-07 15:58:02,756 INFO [RM Event dispatcher] scheduler.AppSchedulingInfo
(AppSchedulingInfo.java:updatePendingResources(257)) - *** Adding scheduler
key: SchedulerRequestKey{priority=0, allocationRequestId=-1,
containerToUpdate=null} for attempt: appattempt_1557237478804_0001_000001
2019-05-07 15:58:02,759 INFO [RM Event dispatcher] attempt.RMAppAttemptImpl
(RMAppAttemptImpl.java:handle(920)) - appattempt_1557237478804_0001_000001
State change from SUBMITTED to SCHEDULED on event = ATTEMPT_ADDED
2019-05-07 15:58:02,892 INFO [main] impl.YarnClientImpl
(YarnClientImpl.java:submitApplication(310)) - Submitted application
application_1557237478804_0001
{noformat}
(some extra lines are printed with ***).
So at 15:58:02,747 the set is empty and populated with a single element at
15:58:02,756 on "RM Event dispatcher". This means there's a tiny time window
during which a {{NODE_UPDATE}} can cause a {{NoSuchElementException}}.
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