Xuan Gong commented on YARN-1402:

bq. Also, there is one important thing we need to think seriously here: do we 
need to cleanup nodes' log aggregation reports in RMApps? I am afraid we have 
to do it because RMApp will always stay in RMContext. Also, each RMApp could 
contains thousands of node reports in large cluster which could occupy so much 
memory of Resource Manager. Thoughts?

This is a good point. The reports also need to be used in generating the 
RMAppLogAggregationWebUI. So, we can not simply delete them. 

updated a new patch and addressed all other comments

> Related Web UI, CLI changes on exposing client API to check log aggregation 
> status
> ----------------------------------------------------------------------------------
>                 Key: YARN-1402
>                 URL: https://issues.apache.org/jira/browse/YARN-1402
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-1402.1.patch, YARN-1402.2.patch, 
> YARN-1402.3.1.patch, YARN-1402.3.2.patch, YARN-1402.3.patch, YARN-1402.4.patch

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