Ashwin Shankar created YARN-4975:
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Summary: Fair Scheduler: exception thrown when a parent queue
marked 'parent' has configured child queues
Key: YARN-4975
URL: https://issues.apache.org/jira/browse/YARN-4975
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.2
Reporter: Ashwin Shankar
We upgraded our clusters to 2.7.2 from 2.4.1 and saw the following exception in
RM logs :
{code}
Caused by:
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.AllocationConfigurationException:
Both <reservation> and type="parent" found for queue root.adhoc which is
unsupported
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.AllocationFileLoaderService.loadQueue(AllocationFileLoaderService.java:519)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.AllocationFileLoaderService.reloadAllocations(AllocationFileLoaderService.java:352)
at
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.initScheduler(FairScheduler.java:1440)
{code}
>From the exception, it looks like we've configured 'reservation', but we've
>not. The issue is that AllocationFileLoaderService#loadQueue assumes that a
>parent queue cannot be marked as 'type=parent' if it has configured child
>queues. That can be a problem in cases where we mark a queue as 'parent' which
>has no configured child queues to start with, but we can add child queues
>later on.
Also the exception is kind of misleading since we haven't configured
'reservation'.
How to reproduce:
Run fair scheduler with following queue config:
{code}
<queue name="p" type="parent">
<weight>10</weight>
<maxRunningApps>300</maxRunningApps>
<queue name="c">
<weight>3</weight>
</queue>
</queue>
{code}
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