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https://issues.apache.org/jira/browse/HBASE-26854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17507730#comment-17507730
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Andrew Kyle Purtell commented on HBASE-26854:
---------------------------------------------

It is probably related to the recent application of the log4j2 backport (see 
HBASE-26802). /cc [~zhangduo]
We suppress ZooKeeper logging by setting the default log level for 
org.apache.zookeeper.* to WARN. For some reason this is no longer effective. 

> Shell startup logs a bunch of noise
> -----------------------------------
>
>                 Key: HBASE-26854
>                 URL: https://issues.apache.org/jira/browse/HBASE-26854
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.5.0
>            Reporter: Nick Dimiduk
>            Priority: Major
>
> I noticed a behavior on branch-2.5 that is not present on master or branch-2: 
> starting up the shell produces a bunch of extra zookeeper logging. The 
> classes are {{zookeeper.ZooKeeper}} and {{zookeeper.ClientCnxn}}.



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