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https://issues.apache.org/jira/browse/YARN-4882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15240495#comment-15240495
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Rohith Sharma K S commented on YARN-4882:
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One of the reason for redirecting recovered applications to separate log file
is, by the time you get to know there is something problem in the cluster the
logs files are flooded especially when RM HA is configured. I agree that
changing log level would help, but it wont solve our log flooding problem.
> 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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