Github user chtyim commented on a diff in the pull request: https://github.com/apache/twill/pull/14#discussion_r83471666 --- Diff: twill-api/src/main/java/org/apache/twill/api/TwillController.java --- @@ -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... 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. 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 -- Also, for the `Future`, it seems like it's better just to carry `LogEntry.Level`.
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