Charan Hebri created YARN-8129:
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             Summary: Improve error message for invalid value in fields 
attributes
                 Key: YARN-8129
                 URL: https://issues.apache.org/jira/browse/YARN-8129
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: ATSv2
            Reporter: Charan Hebri


Query with invalid values for the 'fields' attributes throws a message that 
isn't very informative.
Reader log,
{noformat}
2018-04-09 08:59:46,069 INFO  reader.TimelineReaderWebServices 
(TimelineReaderWebServices.java:getEntities(595)) - Received URL 
/ws/v2/timeline/users/hrt_qa/flows/test_flow/apps?limit=3&fields=INFOS from 
user hrt_qa

2018-04-09 08:59:46,070 INFO  reader.TimelineReaderWebServices 
(TimelineReaderWebServices.java:handleException(173)) - Processed URL 
/ws/v2/timeline/users/hrt_qa/flows/test_flow/apps?limit=3&fields=INFOS but 
encountered exception (Took 1 ms.){noformat}
Here INFOS is the invalid value for the fields attribute.
Response,
{noformat}
{
  "exception": "BadRequestException",
  "message": "java.lang.Exception: No enum constant 
org.apache.hadoop.yarn.server.timelineservice.storage.TimelineReader.Field.INFOS",
  "javaClassName": "org.apache.hadoop.yarn.webapp.BadRequestException"
}{noformat}
The message shouldn't ideally contain the enum information.



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