CalvinConfluent commented on code in PR #18277:
URL: https://github.com/apache/kafka/pull/18277#discussion_r1935979962
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metadata/src/main/java/org/apache/kafka/controller/ClusterControlManager.java:
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@@ -422,7 +425,15 @@ public ControllerResult<BrokerRegistrationReply>
registerBroker(
record.setLogDirs(request.logDirs());
}
- if (!request.incarnationId().equals(prevIncarnationId)) {
+ boolean isUncleanShutdownRegistration;
+ if (uncleanShutdownDetectionEnabled) {
+ isUncleanShutdownRegistration = storedBrokerEpoch !=
request.previousBrokerEpoch();
+ } else {
+ isUncleanShutdownRegistration =
!request.incarnationId().equals(prevIncarnationId);
+ }
+ boolean isBrokerStartUp =
!request.incarnationId().equals(prevIncarnationId);
+
+ if (isUncleanShutdownRegistration) {
Review Comment:
Good question. I think the same principle applies to remove the broker ID
from ISR or ELR. The controller only removes the broker from ISR and ELR from
the replication/data safety perspective. If the broker is able to prove its
data safety(with the broker epoch), the controller should not remove it from
ISR and ELR.
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