ableegoldman commented on a change in pull request #8856:
URL: https://github.com/apache/kafka/pull/8856#discussion_r440473726
##########
File path:
streams/src/main/java/org/apache/kafka/streams/processor/internals/StreamTask.java
##########
@@ -539,19 +537,18 @@ private void writeCheckpointIfNeed() {
/**
* <pre>
* the following order must be followed:
- * 1. checkpoint the state manager -- even if we crash before this step,
EOS is still guaranteed
+ * 1. commit/checkpoint the state manager -- even if we crash before this
step, EOS is still guaranteed
Review comment:
ack
##########
File path:
streams/src/main/java/org/apache/kafka/streams/processor/internals/TaskManager.java
##########
@@ -215,91 +215,54 @@ public void handleAssignment(final Map<TaskId,
Set<TopicPartition>> activeTasks,
"\tExisting standby tasks: {}",
activeTasks.keySet(), standbyTasks.keySet(), activeTaskIds(),
standbyTaskIds());
- final Map<TaskId, Set<TopicPartition>> activeTasksToCreate = new
HashMap<>(activeTasks);
- final Map<TaskId, Set<TopicPartition>> standbyTasksToCreate = new
HashMap<>(standbyTasks);
- final Set<Task> tasksToRecycle = new HashSet<>();
-
builder.addSubscribedTopicsFromAssignment(
activeTasks.values().stream().flatMap(Collection::stream).collect(Collectors.toList()),
logPrefix
);
- // first rectify all existing tasks
final LinkedHashMap<TaskId, RuntimeException> taskCloseExceptions =
new LinkedHashMap<>();
- final Set<Task> tasksToClose = new HashSet<>();
- final Map<TaskId, Map<TopicPartition, OffsetAndMetadata>>
consumedOffsetsAndMetadataPerTask = new HashMap<>();
- final Set<Task> additionalTasksForCommitting = new HashSet<>();
+ final Map<TaskId, Set<TopicPartition>> activeTasksToCreate = new
HashMap<>(activeTasks);
+ final Map<TaskId, Set<TopicPartition>> standbyTasksToCreate = new
HashMap<>(standbyTasks);
+ final LinkedList<Task> tasksToClose = new LinkedList<>();
+ final Set<Task> tasksToRecycle = new HashSet<>();
final Set<Task> dirtyTasks = new HashSet<>();
+ // first rectify all existing tasks
for (final Task task : tasks.values()) {
if (activeTasks.containsKey(task.id()) && task.isActive()) {
updateInputPartitionsAndResume(task,
activeTasks.get(task.id()));
- if (task.commitNeeded()) {
- additionalTasksForCommitting.add(task);
- }
activeTasksToCreate.remove(task.id());
} else if (standbyTasks.containsKey(task.id()) &&
!task.isActive()) {
updateInputPartitionsAndResume(task,
standbyTasks.get(task.id()));
standbyTasksToCreate.remove(task.id());
- // check for tasks that were owned previously but have changed
active/standby status
} else if (activeTasks.containsKey(task.id()) ||
standbyTasks.containsKey(task.id())) {
+ // check for tasks that were owned previously but have changed
active/standby status
tasksToRecycle.add(task);
} else {
- try {
- task.suspend();
- final Map<TopicPartition, OffsetAndMetadata>
committableOffsets = task.prepareCommit();
-
- tasksToClose.add(task);
- if (!committableOffsets.isEmpty()) {
- consumedOffsetsAndMetadataPerTask.put(task.id(),
committableOffsets);
- }
- } catch (final RuntimeException e) {
- final String uncleanMessage = String.format(
- "Failed to close task %s cleanly. Attempting to close
remaining tasks before re-throwing:",
- task.id());
- log.error(uncleanMessage, e);
- taskCloseExceptions.put(task.id(), e);
- // We've already recorded the exception (which is the
point of clean).
- // Now, we should go ahead and complete the close because
a half-closed task is no good to anyone.
- dirtyTasks.add(task);
- }
+ tasksToClose.add(task);
}
}
- if (!consumedOffsetsAndMetadataPerTask.isEmpty()) {
+ for (final Task task : tasksToClose) {
try {
- for (final Task task : additionalTasksForCommitting) {
- final Map<TopicPartition, OffsetAndMetadata>
committableOffsets = task.prepareCommit();
- if (!committableOffsets.isEmpty()) {
- consumedOffsetsAndMetadataPerTask.put(task.id(),
committableOffsets);
+ task.suspend(); // Should be a no-op for active tasks, unless
we hit an exception during handleRevocation
Review comment:
1. I think you're right, we don't need to keep track of the current
`checkpoint` offsets at all and can just write the current
`checkpointableOffsets` in `postCommit`
2. done
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