[jira] [Updated] (YARN-4975) Fair Scheduler: exception thrown when a parent queue marked 'parent' has configured child queues

["Yufei Gu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-4975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yufei Gu updated YARN-4975:
---------------------------
    Attachment: YARN-4975.001.patch

> 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
>            Assignee: Yufei Gu
>         Attachments: YARN-4975.001.patch
>
>
> 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 marked as 'type=parent' cannot have 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 message 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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