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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (YARN-5731) Preemption does not work in few corner cases when reservations are placed
Date Wed, 12 Jul 2017 19:21:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-5731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Sunil G reassigned YARN-5731:

    Assignee: Wangda Tan  (was: Sunil G)

> Preemption does not work in few corner cases when reservations are placed
> -------------------------------------------------------------------------
>                 Key: YARN-5731
>                 URL: https://issues.apache.org/jira/browse/YARN-5731
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler
>    Affects Versions: 2.8.0
>            Reporter: Sunil G
>            Assignee: Wangda Tan
>         Attachments: YARN-5731.001.patch, YARN-5731-branch-2.8.001.patch
> YARN Capacity Scheduler does not kick Preemption under below scenario.
> Two queues A and B each with 50% capacity and 100% maximum capacity and user limit factor
2. Minimum Container size is 1536MB and total cluster resource is 40GB. Now submit the first
job which needs 1536MB for AM and 9 task containers each 4.5GB to queue A. Job will get 8
containers total (AM 1536MB + 7 * 4.5GB = 33GB) and the cluster usage is 93.8% and the job
has reserved a container of 4.5GB.
> Now when next job (1536MB for AM and 9 task containers each 4.5GB) is submitted onto
queue B. The job hangs in ACCEPTED state forever and RM scheduler never kicks in Preemption.
(RM UI Image 2 attached)
> Test Case:
> ./spark-submit --class org.apache.spark.examples.SparkPi --master yarn-client --queue
A --executor-memory 4G --executor-cores 4 --num-executors 9 ../lib/spark-examples*.jar 1000000
> After a minute..
> ./spark-submit --class org.apache.spark.examples.SparkPi --master yarn-client --queue
B --executor-memory 4G --executor-cores 4 --num-executors 9 ../lib/spark-examples*.jar 1000000
> Credit to: [~Prabhu Joseph] for bug investigation and troubleshooting.

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