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https://issues.apache.org/jira/browse/YARN-6901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16108904#comment-16108904
]
Jason Lowe commented on YARN-6901:
----------------------------------
bq. This may not be possible, ideally moving an app from one queue to another
need to lock queue, and assign container need to lock queue as well. It should
be safe.
I'm not sure I understand. Could you elaborate on how the deadlock is
happening? Looking at the branch-2.8 code, I don't see how LeafQueue is
calling assignContainers on the app without holding a lock on the queue.
Therefore I'm confused why the app's assignContainers is blocking on a queue
lock it should already have.
> A CapacityScheduler app->LeafQueue deadlock found in branch-2.8
> ----------------------------------------------------------------
>
> Key: YARN-6901
> URL: https://issues.apache.org/jira/browse/YARN-6901
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 2.8.0
> Reporter: Wangda Tan
> Assignee: Wangda Tan
> Priority: Blocker
> Attachments: YARN-6901.branch-2.8.001.patch
>
>
> Stacktrace:
> {code}
> Thread 22068: (state = BLOCKED)
> -
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.AbstractCSQueue.getParent()
> @bci=0, line=185 (Compiled frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue.getQueuePath()
> @bci=8, line=262 (Compiled frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.allocator.AbstractContainerAllocator.getCSAssignmentFromAllocateResult(org.apache.hadoop.yarn.api.records.Resource,
>
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.allocator.ContainerAllocation,
> org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer)
> @bci=183, line=80 (Compiled frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.allocator.RegularContainerAllocator.assignContainers(org.apache.hadoop.yarn.api.records.Resource,
>
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerNode,
>
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.SchedulingMode,
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceLimits,
> org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer)
> @bci=204, line=747 (Compiled frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.allocator.ContainerAllocator.assignContainers(org.apache.hadoop.yarn.api.records.Resource,
>
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerNode,
>
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.SchedulingMode,
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceLimits,
> org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer)
> @bci=16, line=49 (Compiled frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp.assignContainers(org.apache.hadoop.yarn.api.records.Resource,
>
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerNode,
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceLimits,
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.SchedulingMode,
> org.apache.hadoop.yarn.server.resourcemanager.rmcontainer.RMContainer)
> @bci=61, line=468 (Compiled frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.LeafQueue.assignContainers(org.apache.hadoop.yarn.api.records.Resource,
>
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerNode,
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceLimits,
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.SchedulingMode)
> @bci=148, line=876 (Compiled frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocateContainersToNode(org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerNode)
> @bci=157, line=1149 (Compiled frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.handle(org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.SchedulerEvent)
> @bci=266, line=1277 (Compiled frame)
> ================
> Thread 22124: (state = BLOCKED)
> -
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt.getReservedContainers()
> @bci=0, line=336 (Compiled frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity.FifoCandidatesSelector.preemptFrom(org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp,
> org.apache.hadoop.yarn.api.records.Resource, java.util.Map, java.util.List,
> org.apache.hadoop.yarn.api.records.Resource, java.util.Map,
> org.apache.hadoop.yarn.api.records.Resource) @bci=61, line=277 (Compiled
> frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity.FifoCandidatesSelector.selectCandidates(java.util.Map,
> org.apache.hadoop.yarn.api.records.Resource,
> org.apache.hadoop.yarn.api.records.Resource) @bci=374, line=138 (Compiled
> frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity.ProportionalCapacityPreemptionPolicy.containerBasedPreemptOrKill(org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CSQueue,
> org.apache.hadoop.yarn.api.records.Resource) @bci=264, line=342 (Compiled
> frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity.ProportionalCapacityPreemptionPolicy.editSchedule()
> @bci=34, line=202 (Compiled frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.monitor.SchedulingMonitor.invokePolicy()
> @bci=4, line=81 (Compiled frame)
> -
> org.apache.hadoop.yarn.server.resourcemanager.monitor.SchedulingMonitor$PreemptionChecker.run()
> @bci=23, line=92 (Interpreted frame)
> - java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)
> {code}
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