Github user yaojiefeng commented on a diff in the pull request:
    --- Diff: twill-api/src/main/java/org/apache/twill/api/ 
    @@ -89,4 +90,34 @@
        * @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. It will carry
    +   *         the {@link Map} of the log level as a result with ROOT as the 
logger name and the log level as value.
    +   */
    +  Future<Map<String, LogEntry.Level>> setLogLevel(LogEntry.Level logLevel);
    --- End diff --
    For a particular runnable, user can use setLogLevels(runnableName, 
ImmutableMap.of("ROOT", loglevel)) to change the root log level.

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