Jason918 commented on a change in pull request #14641:
URL: https://github.com/apache/pulsar/pull/14641#discussion_r834899169
##########
File path:
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/AbstractDispatcherMultipleConsumers.java
##########
@@ -36,7 +37,7 @@
protected final CopyOnWriteArrayList<Consumer> consumerList = new
CopyOnWriteArrayList<>();
protected final ObjectSet<Consumer> consumerSet = new ObjectHashSet<>();
- protected volatile int currentConsumerRoundRobinIndex = 0;
+ protected volatile AtomicInteger currentConsumerRoundRobinIndex = new
AtomicInteger(0);
Review comment:
```suggestion
protected AtomicInteger currentConsumerRoundRobinIndex = new
AtomicInteger(0);
```
##########
File path:
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/AbstractDispatcherMultipleConsumers.java
##########
@@ -119,26 +120,30 @@ public Consumer getNextConsumer() {
return null;
}
- if (currentConsumerRoundRobinIndex >= consumerList.size()) {
- currentConsumerRoundRobinIndex = 0;
+ // other thread will change consumerList
+ if (currentConsumerRoundRobinIndex.get() >= consumerList.size()) {
+ currentConsumerRoundRobinIndex.set(0);
}
- int currentRoundRobinConsumerPriority =
consumerList.get(currentConsumerRoundRobinIndex).getPriorityLevel();
+ int currentRoundRobinConsumerPriority =
consumerList.get(currentConsumerRoundRobinIndex.get())
Review comment:
Still, there is race condition between Line 124 and Line 128, if
`consumerList.size` decreases.
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