philipnee commented on code in PR #13550:
URL: https://github.com/apache/kafka/pull/13550#discussion_r1178121430
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractStickyAssignor.java:
##########
@@ -149,47 +148,51 @@ private boolean allSubscriptionsEqual(Set<String>
allTopics,
}
MemberData memberData = memberData(subscription);
+ maxGeneration = Math.max(maxGeneration,
memberData.generation.orElse(DEFAULT_GENERATION));
List<TopicPartition> ownedPartitions = new ArrayList<>();
consumerToOwnedPartitions.put(consumer, ownedPartitions);
- // Only consider this consumer's owned partitions as valid if it
is a member of the current highest
- // generation, or it's generation is not present but we have not
seen any known generation so far
- if (memberData.generation.isPresent() &&
memberData.generation.get() >= maxGeneration
- || !memberData.generation.isPresent() && maxGeneration ==
DEFAULT_GENERATION) {
-
- // If the current member's generation is higher, all the
previously owned partitions are invalid
- if (memberData.generation.isPresent() &&
memberData.generation.get() > maxGeneration) {
- allPreviousPartitionsToOwner.clear();
- partitionsWithMultiplePreviousOwners.clear();
- for (String droppedOutConsumer :
membersOfCurrentHighestGeneration) {
-
consumerToOwnedPartitions.get(droppedOutConsumer).clear();
- }
-
- membersOfCurrentHighestGeneration.clear();
- maxGeneration = memberData.generation.get();
- }
+ // the member has a valid generation, so we can consider its owned
partitions if it has the highest
+ // generation amongst
+ for (final TopicPartition tp : memberData.partitions) {
+ if (allTopics.contains(tp.topic())) {
+ String otherConsumer =
allPreviousPartitionsToOwner.put(tp, consumer);
+ if (otherConsumer == null) {
+ // this partition is not owned by other consumer in
the same generation
+ ownedPartitions.add(tp);
+ } else {
+ final int memberGeneration =
memberData.generation.orElse(DEFAULT_GENERATION);
+ final int otherMemberGeneration =
subscriptions.get(otherConsumer).generationId().orElse(DEFAULT_GENERATION);
+
+ if (memberGeneration == otherMemberGeneration) {
+ if
(subscriptions.get(otherConsumer).generationId().orElse(DEFAULT_GENERATION) ==
memberData.generation.orElse(DEFAULT_GENERATION)) {
+ log.error("Found multiple consumers {} and {}
claiming the same TopicPartition {} in the "
+ + "same generation {}, this will be
invalidated and removed from their previous assignment.",
+ consumer, otherConsumer, tp,
memberGeneration);
+ partitionsWithMultiplePreviousOwners.add(tp);
Review Comment:
From KAFKA-12984:
```
...the assignor will now explicitly look out for partitions that are being
claimed by multiple consumers ... we have to invalidate this partition from the
ownedPartitions of both consumers, since we can't tell who, if anyone, has the
valid claim to this partition.
```
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