Github user chtyim commented on a diff in the pull request:
https://github.com/apache/twill/pull/14#discussion_r90134323
--- Diff: twill-api/src/main/java/org/apache/twill/api/TwillController.java
---
@@ -89,4 +90,45 @@
* @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
+ * the specified logger.
+ *
+ * @param logLevels 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. It will carry the
+ * {@link Map} of log levels as the result.
+ */
+ Future<Map<String, LogEntry.Level>> setLogLevels(Map<String,
LogEntry.Level> logLevels);
+
+ /**
+ * Set the log levels for requested logger names for a {@link
TwillRunnable}.
+ * The log level for a logger name can be {@code null} except for the
root logger, which will reset the log level for
+ * the specified logger.
+ *
+ * @param runnableName The name of the runnable to set the log level.
+ * @param logLevelsForRunnable 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. It will carry the
+ * {@link Map} of log levels as the result.
+ */
+ Future<Map<String, LogEntry.Level>> setLogLevels(String runnableName,
+ Map<String,
LogEntry.Level> logLevelsForRunnable);
+
+ /**
+ * Reset the log levels of all runnables to the default log level,
{@code LogEntry.Level.INFO}.
--- End diff --
Is the default always `INFO`? It's better not to say that.
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