[jira] [Commented] (YARN-1131) $ yarn logs should return a message log aggregation is during progress if YARN application is running

["Siddharth Seth (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-1131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13784613#comment-13784613 ] 

Siddharth Seth commented on YARN-1131:
--------------------------------------

[~djp], if you don't mind, I'd like to take this over - would be good to get it into the next release.

> $ yarn logs should return a message log aggregation is during progress if YARN application is running
> -----------------------------------------------------------------------------------------------------
>
>                 Key: YARN-1131
>                 URL: https://issues.apache.org/jira/browse/YARN-1131
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: client
>            Reporter: Tassapol Athiapinya
>            Assignee: Junping Du
>            Priority: Minor
>             Fix For: 2.1.2-beta
>
>
> In the case when log aggregation is enabled, if a user submits MapReduce job and runs $ yarn logs -applicationId <app ID> while the YARN application is running, the command will return no message and return user back to shell. It is nice to tell the user that log aggregation is in progress.
> {code}
> -bash-4.1$ /usr/bin/yarn logs -applicationId application_1377900193583_0002
> -bash-4.1$
> {code}
> At the same time, if invalid application ID is given, YARN CLI should say that the application ID is incorrect rather than throwing NoSuchElementException.
> {code}
> $ /usr/bin/yarn logs -applicationId application_00000
> Exception in thread "main" java.util.NoSuchElementException
> at com.google.common.base.AbstractIterator.next(AbstractIterator.java:75)
> at org.apache.hadoop.yarn.util.ConverterUtils.toApplicationId(ConverterUtils.java:124)
> at org.apache.hadoop.yarn.util.ConverterUtils.toApplicationId(ConverterUtils.java:119)
> at org.apache.hadoop.yarn.logaggregation.LogDumper.run(LogDumper.java:110)
> at org.apache.hadoop.yarn.logaggregation.LogDumper.main(LogDumper.java:255)
> {code}



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