merlimat commented on a change in pull request #5276: Fixed race condition
while triggering message redelivery after an ack-timeout event
URL: https://github.com/apache/pulsar/pull/5276#discussion_r329706992
##########
File path:
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/Consumer.java
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@@ -546,21 +546,29 @@ public void redeliverUnacknowledgedMessages() {
if (log.isDebugEnabled()) {
log.debug("[{}-{}] consumer {} received redelivery", topicName,
subscription, consumerId);
}
- // redeliver unacked-msgs
- subscription.redeliverUnacknowledgedMessages(this);
- flowConsumerBlockedPermits(this);
+
if (pendingAcks != null) {
- AtomicInteger totalRedeliveryMessages = new AtomicInteger(0);
- pendingAcks.forEach(
- (ledgerId, entryId, batchSize, none) ->
totalRedeliveryMessages.addAndGet((int) batchSize));
- msgRedeliver.recordMultipleEvents(totalRedeliveryMessages.get(),
totalRedeliveryMessages.get());
- pendingAcks.clear();
+ List<PositionImpl> pendingPositions = new ArrayList<>((int)
pendingAcks.size());
+ MutableInt totalRedeliveryMessages = new MutableInt(0);
+ pendingAcks.forEach((ledgerId, entryId, batchSize, none) -> {
+ totalRedeliveryMessages.add((int) batchSize);
+ pendingPositions.add(new PositionImpl(ledgerId, entryId));
+ });
+
+ for (PositionImpl p : pendingPositions) {
+ pendingAcks.remove(p.getLedgerId(), p.getEntryId());
Review comment:
It's to avoid missing any insertion that might be happening into pendingAcks
from a different thread. (eg: if the dispatcher thread was actually sending
messages at the same time)
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