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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9936) Mesos resource manager unable to connect to master after failover
Date Thu, 02 Aug 2018 17:07:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16567083#comment-16567083
] 

ASF GitHub Bot commented on FLINK-9936:
---------------------------------------

tillrohrmann commented on a change in pull request #6464: [FLINK-9936][mesos] WIP 
URL: https://github.com/apache/flink/pull/6464#discussion_r207295725
 
 

 ##########
 File path: flink-mesos/src/main/java/org/apache/flink/mesos/runtime/clusterframework/MesosResourceManager.java
 ##########
 @@ -278,22 +267,76 @@ protected void initialize() throws ResourceManagerException {
 		catch (IOException e) {
 			throw new ResourceManagerException("Unable to configure the artifact server with TaskManager
artifacts.", e);
 		}
+	}
 
-		// begin scheduling
-		connectionMonitor.tell(new ConnectionMonitor.Start(), selfActor);
-		schedulerDriver.start();
+	@Override
+	protected CompletableFuture<Void> prepareLeadershipAsync() {
+		Preconditions.checkState(initializedMesosConfig != null);
+
+		return clearStateFuture
+			.thenRunAsync(() -> {
+				schedulerDriver = initializedMesosConfig.createDriver(
+					new MesosResourceManagerSchedulerCallback(),
+					false);
+
+				// create supporting actors
+				connectionMonitor = createConnectionMonitor();
+				launchCoordinator = createLaunchCoordinator(schedulerDriver, selfActor);
+				reconciliationCoordinator = createReconciliationCoordinator(schedulerDriver);
+				taskMonitor = createTaskMonitor(schedulerDriver);
+			}, getMainThreadExecutor())
+			.thenCombineAsync(getWorkersAsync(), (ignored, tasksFromPreviousAttempts) -> {
+				// recover state
+				recoverWorkers(tasksFromPreviousAttempts);
+
+				// begin scheduling
+				connectionMonitor.tell(new ConnectionMonitor.Start(), selfActor);
+				schedulerDriver.start();
+
+				LOG.info("Mesos resource manager started.");
+				return null;
+			}, getMainThreadExecutor());
+	}
 
-		LOG.info("Mesos resource manager initialized.");
+	@Override
+	protected void clearState() {
+		schedulerDriver.stop(true);
+
+		clearStateFuture = stopSupportingActorsAsync().thenRunAsync(() -> {
+			workersInNew.clear();
+			workersInLaunch.clear();
+			workersBeingReturned.clear();
 
 Review comment:
   Can't we clear these fields right away when `clearState` is called?

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> Mesos resource manager unable to connect to master after failover
> -----------------------------------------------------------------
>
>                 Key: FLINK-9936
>                 URL: https://issues.apache.org/jira/browse/FLINK-9936
>             Project: Flink
>          Issue Type: Bug
>          Components: Mesos, Scheduler
>    Affects Versions: 1.5.0, 1.5.1, 1.6.0
>            Reporter: Renjie Liu
>            Assignee: Gary Yao
>            Priority: Blocker
>              Labels: pull-request-available
>             Fix For: 1.5.3, 1.6.0
>
>
> When deployed in mesos session cluster mode, the connector monitor keeps reporting unable
to connect to mesos after restart. In fact, scheduler driver already connected to mesos master,
but when the connected message is lost. This is because leadership is not granted yet and
fence id is not set, the rpc service ignores the connected message. So we should connect to
mesos master after leadership is granted.



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