npawar commented on a change in pull request #3622: Start and stop
ControllerPeriodicTasks based on leadership changes
URL: https://github.com/apache/incubator-pinot/pull/3622#discussion_r243466001
##########
File path:
pinot-controller/src/main/java/com/linkedin/pinot/controller/helix/core/periodictask/ControllerPeriodicTask.java
##########
@@ -55,67 +57,90 @@ private static long getRandomInitialDelayInSeconds() {
return MIN_INITIAL_DELAY_IN_SECONDS +
RANDOM.nextInt(MAX_INITIAL_DELAY_IN_SECONDS - MIN_INITIAL_DELAY_IN_SECONDS);
}
+ /**
+ * Reset flags, and call initTask which initializes each individual task
+ */
@Override
- public void init() {
+ public final void init() {
+ _stopPeriodicTask = false;
+ _periodicTaskInProgress = false;
+ initTask();
}
+ /**
+ * Execute the ControllerPeriodicTask.
+ * The _periodicTaskInProgress is enabled at the beginning and disabled
before exiting,
+ * to ensure that we can wait for a task in progress to finish when stop has
been invoked
+ */
@Override
- public void run() {
- if (!isLeader()) {
- skipLeaderTask();
- } else {
- List<String> allTableNames = _pinotHelixResourceManager.getAllTables();
- processLeaderTask(allTableNames);
- }
- }
-
- private void skipLeaderTask() {
- if (_isLeader) {
- LOGGER.info("Current pinot controller lost leadership.");
- _isLeader = false;
- onBecomeNotLeader();
- }
- LOGGER.info("Skip running periodic task: {} on non-leader controller",
_taskName);
- }
+ public final void run() {
+ _periodicTaskInProgress = true;
- private void processLeaderTask(List<String> tables) {
- if (!_isLeader) {
- LOGGER.info("Current pinot controller became leader. Starting {} with
running frequency of {} seconds.",
- _taskName, _intervalInSeconds);
- _isLeader = true;
- onBecomeLeader();
- }
+ List<String> tableNamesWithType =
_pinotHelixResourceManager.getAllTables();
Review comment:
Loss of leadership, and regaining it, will invoke
PeriodicTaskScheduler.start() which creates new executor service and calls the
PeriodicTask.init() before scheduling. The init() method resets the
stopPeriodicTask flag. So we should not need to set it to false again.
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