[jira] [Created] (YARN-9454) Add detailed log about list applications command

["Szilard Nemeth (JIRA)" <ji...@apache.org>]

Szilard Nemeth created YARN-9454:
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             Summary: Add detailed log about list applications command
                 Key: YARN-9454
                 URL: https://issues.apache.org/jira/browse/YARN-9454
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Szilard Nemeth


When a user lists YARN applications with the RM admin CLI, we have one audit log here (https://github.com/apache/hadoop/blob/e40e2d6ad5cbe782c3a067229270738b501ed27e/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ClientRMService.java#L924)
However, a more extensive logging could be added.

This is the call chain, when such a list command got executed (from bottom to top):


{code:java}
org.apache.hadoop.yarn.server.resourcemanager.ClientRMService#getApplications
org.apache.hadoop.yarn.client.api.impl.YarnClientImpl#getApplications(java.util.Set<java.lang.String>, java.util.EnumSet<org.apache.hadoop.yarn.api.records.YarnApplicationState>, java.util.Set<java.lang.String>)
ApplicationCLI.listApplications(Set<String>, EnumSet<YarnApplicationState>, Set<String>)  (org.apache.hadoop.yarn.client.cli)
ApplicationCLI.run(String[])  (org.apache.hadoop.yarn.client.cli)
{code}


org.apache.hadoop.yarn.server.resourcemanager.ClientRMService#getApplications: This is the place that fits perfectly for adding a more detailed log message about the request or the response (or both).
In my opinion, a trace (or debug) level log would be great at the end of this method, logging the whole response, so any potential issues with the code can be troubleshot more easily. 



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