lucasbru commented on code in PR #20600:
URL: https://github.com/apache/kafka/pull/20600#discussion_r2382499866
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group-coordinator/src/main/resources/common/message/StreamsGroupMetadataValue.json:
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@@ -24,6 +24,8 @@
{ "name": "Epoch", "versions": "0+", "type": "int32",
"about": "The group epoch." },
{ "name": "MetadataHash", "versions": "0+", "type": "int64",
- "about": "The hash of all topics in the group." }
+ "about": "The hash of all topics in the group." },
+ { "name": "ValidatedTopologyEpoch", "versions": "0+", "taggedVersions":
"0+", "tag": 0, "default": -1, "type": "int32",
Review Comment:
We add the field as a tagged field, so if we are compatible without bumping
the version.
If a new kafka reads a record without ValidatedTopologyEpoch, it will assume
the default -1 and revalidate the topology.
If an old kafka reads a record with ValidatedTopologyEpoch, it will be
ignored.
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