[jira] [Updated] (YARN-10448) SLS should set default user to handle SYNTH format

["zhuqi (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-10448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

zhuqi updated YARN-10448:
-------------------------
    Attachment: image-2020-10-11-22-01-37-227.png

> SLS should set default user to handle SYNTH format
> --------------------------------------------------
>
>                 Key: YARN-10448
>                 URL: https://issues.apache.org/jira/browse/YARN-10448
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler-load-simulator
>    Affects Versions: 3.2.1, 3.4.0
>            Reporter: zhuqi
>            Assignee: zhuqi
>            Priority: Major
>         Attachments: YARN-10448.001.patch, YARN-10448.002.patch, YARN-10448.003.patch, image-2020-10-11-22-01-37-227.png
>
>
> When using the synthetic generator json file example from the doc ( https://hadoop.apache.org/docs/current/hadoop-sls/SchedulerLoadSimulator.html#SYNTH_JSON_input_file_format ), it throws the following exception:
> {noformat}
> java.lang.IllegalArgumentException: Null user
> at org.apache.hadoop.security.UserGroupInformation.createRemoteUser(UserGroupInformation.java:1269)
> at org.apache.hadoop.security.UserGroupInformation.createRemoteUser(UserGroupInformation.java:1256)
> at org.apache.hadoop.yarn.sls.appmaster.AMSimulator.submitReservationWhenSpecified(AMSimulator.java:191)
> at org.apache.hadoop.yarn.sls.appmaster.AMSimulator.firstStep(AMSimulator.java:161)
> at org.apache.hadoop.yarn.sls.scheduler.TaskRunner$Task.run(TaskRunner.java:88)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> {noformat}
> So the solution is either:
> 1) to make {{user_name}} a mandatory field, or
> 2) to set default user in SLS code if the json file does not define it.
> IMO, solution 2 might be better, because in most cases (if not all) {{user_name}} has no impact on scheduler performance, thus it is reasonable to make it an optional field, which is also consistent with the {{job.user}} field in SLS JSON file.



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