nicktelford commented on code in PR #16922:
URL: https://github.com/apache/kafka/pull/16922#discussion_r1735025825
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streams/src/main/java/org/apache/kafka/streams/processor/internals/TaskManager.java:
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@@ -454,6 +479,24 @@ private void handleTasksWithoutStateUpdater(final
Map<TaskId, Set<TopicPartition
final Map<TaskId,
Set<TopicPartition>> standbyTasksToCreate,
final Map<Task,
Set<TopicPartition>> tasksToRecycle,
final Set<Task>
tasksToCloseClean) {
+ final Map<Task, Set<TopicPartition>> initialStandbyTasksToRecycle =
assignInitialTasks(activeTasksToCreate, logPrefix, topologyMetadata,
changelogReader);
+ final Map<Task, Set<TopicPartition>> initialStandbyTasksToUse =
assignInitialTasks(activeTasksToCreate, logPrefix, topologyMetadata,
changelogReader);
+ final Set<TaskId> recycledInitialTasks = new
HashSet<>(initialStandbyTasksToRecycle.size() +
initialStandbyTasksToUse.size());
+
+ // if this was the last local thread to receive its assignment, close
all the remaining Tasks, as they are not needed
+ stateDirectory.closeInitialTasksIfLastAssginedThread();
+
+ // recycle the initial standbys to active, and remove them from the
set of actives that need to be created
+ tasksToRecycle.putAll(initialStandbyTasksToRecycle);
Review Comment:
Not sure I understand what you're suggesting here. We're essentially just
adding the Tasks to the TaskRegistry, and then letting the loop below finish
setting them up.
We have to do some extra book-keeping to ensure we don't create new Tasks
that we already have "pending" standbys for.
Can you elaborate?
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