Github user yaojiefeng commented on a diff in the pull request:
https://github.com/apache/twill/pull/14#discussion_r90767395
--- 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}.
+ *
+ * @return A {@link Future} that will be completed when the set log
level operation has been done.
+ */
+ Future<String> resetLogLevels();
+
+ /**
+ * Reset the log levels of the given runnable to the log levels when .
--- End diff --
Yes. The future is completed when the message is processed. We are not sure
about whether the request is successful or not. Now the live node will be
updated only if the log level set is completed.
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