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

    https://github.com/apache/twill/pull/14#discussion_r87254498
  
    --- Diff: 
twill-yarn/src/main/java/org/apache/twill/internal/ServiceMain.java ---
    @@ -264,6 +262,10 @@ protected String getLoggerLevel(Logger logger) {
         return "OFF";
       }
     
    +  protected String getLogLevels() {
    +    return "";
    --- End diff --
    
    For a launch, the `TwillContainerService` is constructed before the run of 
`doMain` method, which means the we have not called `configureLogger()` method 
at that time so log level setting at constructor will not work. 


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