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From "Tao Yang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-8804) resourceLimits may be wrongly calculated when leaf-queue is blocked in cluster with 3+ level queues
Date Thu, 20 Sep 2018 07:34:00 GMT
Tao Yang created YARN-8804:

             Summary: resourceLimits may be wrongly calculated when leaf-queue is blocked
in cluster with 3+ level queues
                 Key: YARN-8804
                 URL: https://issues.apache.org/jira/browse/YARN-8804
             Project: Hadoop YARN
          Issue Type: Bug
          Components: capacityscheduler
    Affects Versions: 3.2.0
            Reporter: Tao Yang
            Assignee: Tao Yang

This problem is due to YARN-4280, parent queue will deduct child queue's headroom when the
child queue reached its resource limit and the skipped type is QUEUE_LIMIT, the resource limits
of deepest parent queue will be correctly calculated, but for non-deepest parent queue, its
headroom may be much more than the sum of reached-limit child queues' headroom, so that the
resource limit of non-deepest parent may be much less than its true value and block the allocation
for later queues.

To reproduce this problem with UT:
(1) Cluster has two nodes whose node resource both are <10GB, 10core> and 3-level queues
as below, among them max-capacity of "c1" is 10 and others are all 100, so that max-capacity
of queue "c1" is <2GB, 2core>
                 /  |    \
                a   b    c
               10   20  70
                             |   \
                           c1   c2
                10(max=10)  90
(2) Submit app1 to queue "c1" and launch am1(resource=<1GB, 1 core>) on nm1
(3) Submit app2 to queue "b" and launch am2(resource=<1GB, 1 core>) on nm1
(4) app1 and app2 both ask one <2GB, 1core> containers. 
(5) nm1 do 1 heartbeat
Now queue "c" has lower capacity percentage than queue "b", the allocation sequence will be
"a" -> "c" -> "b",
queue "c1" has reached queue limit so that requests of app1 should be pending, 
headroom of queue "c1" is <1GB, 1core> (=max-capacity - used), 
headroom of queue "c" is <18GB, 18core> (=max-capacity - used), 
after allocation for queue "c", resource limit of queue "b" will be wrongly calculated as
<2GB, 2core>,
headroom of queue "b" will be <1GB, 1core> (=resource-limit - used)
so that scheduler won't allocate one container for app2 on nm1

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