Github user yaojiefeng commented on a diff in the pull request:
https://github.com/apache/twill/pull/14#discussion_r87877029
--- 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 log levels for requested logger names for Twill applications
running in a container.
+ * The log level for a logger name can be {@code null} except for the
root logger, which will reset the log level for
--- End diff --
We check it using `Preconditions.checkArgument`, so an exception will be
thrown for null log level for root logger.
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