Github user chtyim commented on a diff in the pull request:
https://github.com/apache/twill/pull/14#discussion_r82098265
--- Diff: twill-api/src/main/java/org/apache/twill/api/TwillController.java
---
@@ -89,4 +90,29 @@
* @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 running in a container.
+ *
+ * @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.
+ */
+ Future<String> setLogLevel(LogEntry.Level logLevel);
+
+ /**
+ * Set the log levels for requested logger names for Twill applications
running in a container.
+ *
+ * @param logLevelAppArgs The {@link Map} contains the requested logger
names and log levels that need to be set.
+ * @return A {@link Future} that will be completed when the set log
level operation has been done.
+ */
+ Future<String> setLogLevel(Map<String, LogEntry.Level> logLevelAppArgs);
+
+ /**
+ * Set the log levels for requested logger names for a {@link
TwillRunnable}.
+ *
+ * @param runnableName The name of the runnable to set the log level.
+ * @param logLevels The {@link Map} contains the requested logger name
and log level that need to be changed.
+ * @return A {@link Future} that will be completed when the set log
level operation has been done.
+ */
+ Future<String> setLogLevel(String runnableName, Map<String,
LogEntry.Level> logLevels);
--- End diff --
`setLogLevels`.
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