merlimat commented on a change in pull request #9554:
URL: https://github.com/apache/pulsar/pull/9554#discussion_r573942728
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File path:
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/AbstractTopic.java
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@@ -382,17 +382,25 @@ public String getReplicatorPrefix() {
switch (producer.getAccessMode()) {
case Shared:
if (hasExclusiveProducer ||
!waitingExclusiveProducers.isEmpty()) {
- return FutureUtil.failedFuture(new ProducerBusyException(
- "Topic has an existing exclusive producer: " +
producers.keys().nextElement()));
+ StringBuilder errorMsg = new StringBuilder();
+ errorMsg.append("Topic has an existing exclusive
producer");
+ if (producers.keys().hasMoreElements()) {
+ errorMsg.append(": " + producers.keys().nextElement());
Review comment:
I'm not sure this avoids the race altogether since there's no atomicity
between checking `hasMoreElements()` and `nextElement()`. I think we could get
an iterator and use that to check, since it will be guaranteed to be consistent.
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