guozhangwang commented on a change in pull request #9671:
URL: https://github.com/apache/kafka/pull/9671#discussion_r558623815
##########
File path:
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinator.java
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@@ -1342,10 +1351,17 @@ public void run() {
long now = time.milliseconds();
if (coordinatorUnknown()) {
- if (findCoordinatorFuture != null ||
lookupCoordinator().failed())
+ if (findCoordinatorFuture != null ||
lookupCoordinator().failed()) {
Review comment:
The nested condition is a bit awkward, how about this:
```
// try to find coordinator once if we have not yet done so; otherwise
backoff properly
if (findCoordinatorFuture != null) {
AbstractCoordinator.this.wait(rebalanceConfig.retryBackoffMs);
} else {
lookupCoordinator();
}
// now findCoordinatorFuture should not be null;
// if it has failed, clear it so that hb thread can try discover again in
the next loop in case main thread is busy
if (findCoordinatorFuture.failed()) {
clearFindCoordinatorFuture();
}
```
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