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https://issues.apache.org/jira/browse/TWILL-138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15570055#comment-15570055
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ASF GitHub Bot commented on TWILL-138:
--------------------------------------

Github user yaojiefeng commented on a diff in the pull request:

    https://github.com/apache/twill/pull/14#discussion_r83111652
  
    --- Diff: twill-api/src/main/java/org/apache/twill/api/TwillController.java 
---
    @@ -89,4 +90,30 @@
        * @return A {@link Future} that will be completed when the restart 
operation has been done.
        */
       Future<String> restartInstances(String runnable, int instanceId, int... 
moreInstanceIds);
    +
    +  /**
    +   * Set the root log level for Twill applications in all containers.
    +   *
    +   * @param logLevel The log level for the root logger to change.
    +   * @return A {@link Future} that will be completed when the set log 
level operation has been done.
    --- End diff --
    
    The `String` in `Future` in `setLogLevel` and `setLogLevels` for the 
application is the string representation of the log levels passed in, the 
`String` in `Future` for `setLogLevels` for a runnable is the runnableName.


> Runtime change of Application runnable log level
> ------------------------------------------------
>
>                 Key: TWILL-138
>                 URL: https://issues.apache.org/jira/browse/TWILL-138
>             Project: Apache Twill
>          Issue Type: New Feature
>          Components: core
>            Reporter: Henry Saputra
>
> With TWILL-24 is supported for setting log level when starting the Twill 
> application, next enhancement is to able to send command to update the 
> aggregate log level for a particular runnable in a Twill application.



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