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https://issues.apache.org/jira/browse/YARN-6873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16116141#comment-16116141
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Wenxin He commented on YARN-6873:
---------------------------------

Verified +1: 
I added {{EWMA}}  to {{log4j.rootLogger}} in log4j.properties
{noformat}
log4j.rootLogger=${hadoop.root.logger}, EventCounter, EWMA
{noformat}
, restarted ApplicationHistoryServer and found "Errors/Warnings" link in the 
web http://<ApplicationHistoryServer address>:8188/applicationhistory.

BTW: 
The issue we broke in [^YARN-6873.003.patch] may not be YARN-2901. YARN-3511 
introduced the code that we broke,  am I right? 

> Moving logging APIs over to slf4j in 
> hadoop-yarn-server-applicationhistoryservice
> ---------------------------------------------------------------------------------
>
>                 Key: YARN-6873
>                 URL: https://issues.apache.org/jira/browse/YARN-6873
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Yeliang Cang
>            Assignee: Yeliang Cang
>         Attachments: YARN-6873.001.patch, YARN-6873.002.patch, 
> YARN-6873.003.patch, YARN-6873.004.patch
>
>




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