[jira] [Created] (YARN-11278) Ambiguous error message in mutation API

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

András Győri created YARN-11278:
-----------------------------------

             Summary: Ambiguous error message in mutation API
                 Key: YARN-11278
                 URL: https://issues.apache.org/jira/browse/YARN-11278
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: capacity scheduler
            Reporter: András Győri


In RMWebServices#updateSchedulerConfiguration, we are checking two prerequisites:
{code:java}
if (scheduler instanceof MutableConfScheduler && ((MutableConfScheduler)
    scheduler).isConfigurationMutable()) { {code}
However, the error message is misleading in the second case (namely if the configuration is not mutable eg. a FILE_CONFIGURATION_STORE)
{code:java}
} else {
  return Response.status(Status.BAD_REQUEST)
      .entity("Configuration change only supported by " +
          "MutableConfScheduler.")
      .build(); {code}
 



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