Github user yaojiefeng commented on a diff in the pull request:
    --- Diff: twill-api/src/main/java/org/apache/twill/api/ 
    @@ -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... 
    +  /**
    +   * 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.

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