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https://issues.apache.org/jira/browse/YARN-4882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15291155#comment-15291155
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Jason Lowe commented on YARN-4882:
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bq. let us start with debug logging success cases. If we ever run into a case
of needing logs for success cases, let us add a separate logger.
Yep, sounds good.
> Change the log level to DEBUG for recovering completed applications
> -------------------------------------------------------------------
>
> Key: YARN-4882
> URL: https://issues.apache.org/jira/browse/YARN-4882
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Reporter: Rohith Sharma K S
> Assignee: Daniel Templeton
>
> I think for recovering completed applications no need to log as INFO, rather
> it can be made it as DEBUG. The problem seen from large cluster is if any
> issue happens during RM start up and continuously switching , then RM logs
> are filled with most with recovering applications only.
> There are 6 lines are logged for 1 applications as I shown in below logs,
> then consider RM default value for max-completed applications is 10K. So for
> each switch 10K*6=60K lines will be added which is not useful I feel.
> {noformat}
> 2016-03-01 10:20:59,077 INFO
> org.apache.hadoop.yarn.server.resourcemanager.RMAppManager: Default priority
> level is set to application:application_1456298208485_21507
> 2016-03-01 10:20:59,094 INFO
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppImpl: Recovering
> app: application_1456298208485_21507 with 1 attempts and final state =
> FINISHED
> 2016-03-01 10:20:59,100 INFO
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl:
> Recovering attempt: appattempt_1456298208485_21507_000001 with final state:
> FINISHED
> 2016-03-01 10:20:59,107 INFO
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl:
> appattempt_1456298208485_21507_000001 State change from NEW to FINISHED
> 2016-03-01 10:20:59,111 INFO
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppImpl:
> application_1456298208485_21507 State change from NEW to FINISHED
> 2016-03-01 10:20:59,112 INFO
> org.apache.hadoop.yarn.server.resourcemanager.RMAuditLogger: USER=rohith
> OPERATION=Application Finished - Succeeded TARGET=RMAppManager
> RESULT=SUCCESS APPID=application_1456298208485_21507
> {noformat}
> The main problem is missing important information's from the logs before RM
> unstable. Even though log roll back is 50 or 100, in a short period all these
> logs will be rolled out and all the logs contains only RM switching
> information that too recovering applications!!.
> I suggest at least completed applications recovery should be logged as DEBUG.
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