Zoltan Siegl created YARN-9545:
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             Summary: 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


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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