mcvsubbu 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_r243671750
##########
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:
OK, I think the way ControllerPeriodicTask is right now, it has no clue
whether it has been scheduled or not (until the first time it's run method is
called). So, I think the states may not work right. Let us leave it at two
booleans for now.
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