codelipenghui commented on a change in pull request #7299:
URL: https://github.com/apache/pulsar/pull/7299#discussion_r451542303
##########
File path:
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/ReplicatedSubscriptionsController.java
##########
@@ -70,6 +74,56 @@
public ReplicatedSubscriptionsController(PersistentTopic topic, String
localCluster) {
this.topic = topic;
this.localCluster = localCluster;
+
+ this.publishContext = new Topic.PublishContext() {
+ @Override
+ public void completed(Exception e, long ledgerId, long entryId) {
+ // Nothing to do in case of publish errors since the retry
logic is applied upstream
+ // after a snapshot is not closed
+ if (log.isDebugEnabled()) {
+ log.debug("[{}] Published marker at {}:{}. Exception: {}",
topic.getName(), ledgerId, entryId, e);
+ }
+
+ if (e == null) {
+ // Acknowledge the marker message to prevent it from
accumulating in the backlog
+ Position position = new PositionImpl(ledgerId, entryId);
+ topic.getSubscriptions().forEach((subName, sub) -> {
+ if (sub != null) {
+
sub.acknowledgeMessage(Collections.singletonList(position), AckType.Individual,
+ Collections.emptyMap());
+ }
+ });
+ }
+ }
+ };
+
+ this.publishContextForSnapshot = new Topic.PublishContext() {
+ @Override
+ public void completed(Exception e, long ledgerId, long entryId) {
+ // Nothing to do in case of publish errors since the retry
logic is applied upstream
+ // after a snapshot is not closed
+ if (log.isDebugEnabled()) {
+ log.debug("[{}] Published snapshot at {}:{}. Exception:
{}", topic.getName(), ledgerId, entryId, e);
+ }
+
+ if (e == null) {
+ // If no consumers are connected, or if they are connected
but cannot receive any messages
+ // (i.e. the dispatcher is not reading new entries),
acknowledge the snapshot message
+ // to prevent it from accumulating in the backlog
+ Position position = new PositionImpl(ledgerId, entryId);
+ topic.getSubscriptions().forEach((subName, sub) -> {
+ if (sub != null) {
+ Dispatcher dispatcher = sub.getDispatcher();
+ if (dispatcher == null ||
!dispatcher.isAtleastOneConsumerAvailable()) {
+
sub.acknowledgeMessage(Collections.singletonList(position), AckType.Individual,
+ Collections.emptyMap());
+ }
Review comment:
> Is there any other solution to this issue?
I also don’t have a very good way, it looks okay, just an extreme case
> If there are no subscriptions on the topic, we don't need to ack since the
messages will not accumulate in the backlog, do we?
make sense
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