[jira] [Commented] (YARN-9545) Create healthcheck REST endpoint for ATSv2

["Prabhu Joseph (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-9545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16837217#comment-16837217 ] 

Prabhu Joseph commented on YARN-9545:
-------------------------------------

[~zsiegl] ATSV2 reader is a separate daemon {{TimelineReaderServer}}, writer is an Auxillary service part of each {{NodeManager}}. Reader exposes Rest Api, we can use about rest api "http://yarn-ats-3:8198/ws/v2/timeline" to check if TimelineReader Server is running fine or not.  For writer, health check of NM should be enough. 

> Create healthcheck REST endpoint for ATSv2
> ------------------------------------------
>
>                 Key: YARN-9545
>                 URL: https://issues.apache.org/jira/browse/YARN-9545
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: ATSv2
>    Affects Versions: 3.1.2
>            Reporter: Zoltan Siegl
>            Assignee: Zoltan Siegl
>            Priority: Major
>
> RM UI2 and CM needs a health check url for ATSv2 service.
> Create a /health rest endpoint
>  * must respond with 200 \{health: ok} if all ok
>  * must respond with non 200 if any problem occurs
>  * could check reader/writer connection



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