FrankYang0529 commented on code in PR #19523:
URL: https://github.com/apache/kafka/pull/19523#discussion_r2063441134
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group-coordinator/src/main/java/org/apache/kafka/coordinator/group/Group.java:
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@@ -209,4 +219,50 @@ void validateOffsetFetch(
default boolean shouldExpire() {
return true;
}
+
+ /**
+ * Computes the hash of the topics in a group.
+ *
+ * @param topicHashes The map of topic hashes. Key is topic name and value
is the topic hash.
+ * @return The hash of the group.
+ */
+ static long computeGroupHash(Map<String, Long> topicHashes) {
+ return Hashing.combineOrdered(
+ topicHashes.entrySet()
+ .stream()
+ .sorted(Map.Entry.comparingByKey())
+ .map(e -> HashCode.fromLong(e.getValue()))
+ .toList()
+ ).asLong();
+ }
+
+ /**
+ * Computes the hash of the topic id, name, number of partitions, and
partition racks by Murmur3.
+ *
+ * @param topicImage The topic image.
+ * @param clusterImage The cluster image.
+ * @return The hash of the topic.
+ */
+ static long computeTopicHash(TopicImage topicImage, ClusterImage
clusterImage) {
+ HashFunction hf = Hashing.murmur3_128();
+ Hasher topicHasher = hf.newHasher()
+ .putByte((byte) 0) // magic byte
+ .putLong(topicImage.id().hashCode()) // topic Id
+ .putString(topicImage.name(), StandardCharsets.UTF_8) // topic name
+ .putInt(topicImage.partitions().size()); // number of partitions
+
+
topicImage.partitions().entrySet().stream().sorted(Map.Entry.comparingByKey()).forEach(entry
-> {
Review Comment:
Good suggestion! Thanks. Updated it.
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