jiazhai commented on a change in pull request #2400: Dead Letter Topic
URL: https://github.com/apache/incubator-pulsar/pull/2400#discussion_r211190516
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File path:
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentDispatcherMultipleConsumers.java
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@@ -556,13 +618,90 @@ public synchronized void
redeliverUnacknowledgedMessages(Consumer consumer) {
@Override
public synchronized void redeliverUnacknowledgedMessages(Consumer
consumer, List<PositionImpl> positions) {
- positions.forEach(position ->
messagesToReplay.add(position.getLedgerId(), position.getEntryId()));
if (log.isDebugEnabled()) {
log.debug("[{}-{}] Redelivering unacknowledged messages for
consumer {}", name, consumer, positions);
}
+ if (maxRedeliveryCount > 0 && redeliveryTracker != null) {
+ for (PositionImpl position : positions) {
+ if (redeliveryTracker.incrementAndGetRedeliveryCount(position)
<= maxRedeliveryCount) {
+ messagesToReplay.add(position.getLedgerId(),
position.getEntryId());
+ } else {
+ messagesToDeadLetter.add(position);
+ }
+ }
+ if (messagesToDeadLetter.size() > 0) {
+ CountDownLatch latch = new
CountDownLatch(messagesToDeadLetter.size());
+ for (PositionImpl position : messagesToDeadLetter) {
+ cursor.asyncReadEntry(position, new
AsyncCallbacks.ReadEntryCallback() {
Review comment:
ReadEntries would reduce the calling between broker and bookie.
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