chia7712 commented on code in PR #19508:
URL: https://github.com/apache/kafka/pull/19508#discussion_r2080185161
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clients/src/main/java/org/apache/kafka/common/requests/ListGroupsRequest.java:
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@@ -50,8 +53,19 @@ public ListGroupsRequest build(short version) {
"v" + version + ", but we need v4 or newer to request
groups by states.");
}
if (!data.typesFilter().isEmpty() && version < 5) {
- throw new UnsupportedVersionException("The broker only
supports ListGroups " +
- "v" + version + ", but we need v5 or newer to request
groups by type.");
+ // Types filter is supported by brokers with version 4.0.0 or
later. Older brokers only support
+ // classic groups, so listing consumer groups on an older
broker does not need to use a types filter.
+ // If the types filter is only for consumer and classic, or
just classic groups, it can be safely omitted.
+ // This allows a modern admin client to list consumer groups
on older brokers in a straightforward way.
+ HashSet<String> typesCopy = new HashSet<>(data.typesFilter());
+ boolean containedClassic =
typesCopy.remove(GroupType.CLASSIC.toString());
+ boolean containedConsumer =
typesCopy.remove(GroupType.CONSUMER.toString());
+ if (!typesCopy.isEmpty() || (!containedClassic &&
containedConsumer)) {
Review Comment:
> Modern consumer groups would be reported as classic groups, because the
RPC response was not able to distinguish.
My point was the request
`ListGroupsOptions.withTypes(List.of(GroupType.CLASSIC))` will get both classic
and consumer groups from 3.7 broker when KIP-848 EA enabled. That is a bit
weird to me, as users are expected to receive only the classic groups. Hence,
maybe we should throw `UnsupportedVersionException` for that case?
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