AndrewJSchofield commented on code in PR #19508:
URL: https://github.com/apache/kafka/pull/19508#discussion_r2063299867
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clients/src/main/java/org/apache/kafka/common/requests/ListGroupsRequest.java:
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@@ -50,8 +53,18 @@ 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)) {
+ throw new UnsupportedVersionException("The broker only
supports ListGroups " +
+ "v" + version + ", but we need v5 or newer to request
groups by type.");
Review Comment:
Added.
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