chia7712 commented on code in PR #19320:
URL: https://github.com/apache/kafka/pull/19320#discussion_r2021417242
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clients/src/main/java/org/apache/kafka/common/ClusterResourceListener.java:
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@@ -24,7 +24,7 @@
* <p>
* <h4>Clients</h4>
* There will be one invocation of {@link
ClusterResourceListener#onUpdate(ClusterResource)} after each metadata response.
- * Note that the cluster id may be null when the Kafka broker version is below
0.10.1.0. If you receive a null cluster id, you can expect it to always be null
unless you have a cluster with multiple broker versions which can happen if the
cluster is being upgraded while the client is running.
+ * Note the minimum supported broker version is 2.1. If you receive a null
cluster id, you can expect it to always be null unless you have a cluster with
multiple broker versions which can happen if the cluster is being upgraded
while the client is running.
Review Comment:
It is impossible to have "null" cluster id for now, right?
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