guozhangwang commented on a change in pull request #8964:
URL: https://github.com/apache/kafka/pull/8964#discussion_r463790190
##########
File path:
streams/src/main/java/org/apache/kafka/streams/processor/internals/TaskManager.java
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@@ -368,7 +313,96 @@ public void handleAssignment(final Map<TaskId,
Set<TopicPartition>> activeTasks,
addNewTask(task);
}
}
+ }
+
+ private void handleCloseAndRecycle(final List<Task> tasksToRecycle,
+ final List<Task> tasksToCloseClean,
+ final List<Task> tasksToCloseDirty,
+ final Map<TaskId, Set<TopicPartition>>
activeTasksToCreate,
+ final Map<TaskId, Set<TopicPartition>>
standbyTasksToCreate,
+ final LinkedHashMap<TaskId,
RuntimeException> taskCloseExceptions) {
+ if (!tasksToCloseDirty.isEmpty()) {
+ throw new IllegalArgumentException("Tasks to close-dirty should be
empty");
+ }
+
+ // for all tasks to close or recycle, we should first right a
checkpoint as in post-commit
+ final List<Task> tasksToCheckpoint = new
ArrayList<>(tasksToCloseClean);
+ tasksToCheckpoint.addAll(tasksToRecycle);
+ for (final Task task : tasksToCheckpoint) {
+ try {
+ // Always try to first suspend and commit the task before
checkpointing it;
+ // some tasks may already be suspended which should be a no-op.
+ //
+ // Also since active tasks should already be suspended /
committed and
+ // standby tasks should have no offsets to commit, we should
expect nothing to commit
+ task.suspend();
+
+ // Note that we are not actually committing here but just
check if we need to write checkpoint file:
+ // 1) for active tasks prepareCommit should return empty if it
has committed during suspension successfully,
+ // and their changelog positions should not change at all
postCommit would not write the checkpoint again.
+ // 2) for standby tasks prepareCommit should always return
empty, and then in postCommit we would probably
+ // write the checkpoint file.
+ final Map<TopicPartition, OffsetAndMetadata> offsets =
task.prepareCommit();
Review comment:
I tried some ways and ended-up with explicitly specifying suspend /
postCommit for `standby` tasks only, and use `prepareCommit` to check if the
previous revocation has failed or not. Personally I'm happy with the current
workflow now.
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