mjsax commented on code in PR #20147:
URL: https://github.com/apache/kafka/pull/20147#discussion_r2198869297
##########
streams/integration-tests/src/test/java/org/apache/kafka/streams/integration/KafkaStreamsTelemetryIntegrationTest.java:
##########
@@ -279,18 +281,28 @@ public void shouldPassMetrics(final String topologyType,
final boolean stateUpda
// Streams metrics should get passed to Admin and Consumer
streamsApplicationProperties = props(stateUpdaterEnabled,
groupProtocol);
final Topology topology = topologyType.equals("simple") ?
simpleTopology(false) : complexTopology();
-
+
+ final AtomicInteger runningStateCount = new AtomicInteger(0);
+ final int expectedRunningStateCount =
DEFAULT_GROUP_PROTOCOL.equals(groupProtocol) || "simple".equals(topologyType) ?
1 : 2;
Review Comment:
It's not clear to my, why "simple" topologies show different behavior,
compare to "complex" ones.
When I run the code for "simple" I get the follow log from the consumer:
```[2025-07-10 14:28:52,035] INFO [Consumer
clientId=shouldPassMetricsBi3tKRB2SZOSy_YU2ch9rw-5921224d-0525-4866-9db4-71f9f95c99cd-StreamThread-1-consumer,
groupId=shouldPassMetricsBi3tKRB2SZOSy_YU2ch9rw] Assigned tasks with local
epoch 0
Member: dL_1PoEdQ4C9BhYUVUzFUQ
Assigned active tasks: [0_0]
Owned active tasks: []
Active tasks to revoke: []
Assigned standby tasks: []
Owned standby tasks: []
Assigned warm-up tasks: []
Owned warm-up tasks: []
(org.apache.kafka.clients.consumer.internals.StreamsMembershipManager:1029)
```
As you can see, the task is assigned and we only get a single rebalance.
However, when the test executed for "complex" topology, the consumer first
logs:
```
[2025-07-10 14:29:23,384] INFO [Consumer
clientId=shouldPassMetricsx1__GHUPQvS0AkXE48xleQ-3f598d1a-1f8a-4923-9332-0d947bb38ab2-StreamThread-1-consumer,
groupId=shouldPassMetricsx1__GHUPQvS0AkXE48xleQ] Assigned tasks with local
epoch 0
Member: mcJBdaR5TF2QjDoMvLXKBw
Assigned active tasks: []
Owned active tasks: []
Active tasks to revoke: []
Assigned standby tasks: []
Owned standby tasks: []
Assigned warm-up tasks: []
Owned warm-up tasks: []
(org.apache.kafka.clients.consumer.internals.StreamsMembershipManager:1029)
```
and there is no task assignment yet. Only a second rebalance will do the
assignment:
```
[2025-07-10 14:29:28,393] INFO [Consumer
clientId=shouldPassMetricsx1__GHUPQvS0AkXE48xleQ-3f598d1a-1f8a-4923-9332-0d947bb38ab2-StreamThread-1-consumer,
groupId=shouldPassMetricsx1__GHUPQvS0AkXE48xleQ] Assigned tasks with local
epoch 1
Member: mcJBdaR5TF2QjDoMvLXKBw
Assigned active tasks: [0_0, 0_1, 1_0, 1_1]
Owned active tasks: []
Active tasks to revoke: []
Assigned standby tasks: []
Owned standby tasks: []
Assigned warm-up tasks: []
Owned warm-up tasks: []
(org.apache.kafka.clients.consumer.internals.StreamsMembershipManager:1029)
```
Why do we get the assignment for the simple case in the first rebalance
already, but not for the second case? Is it because the complex topology needs
to create a repartition topic, and thus, does not even try to compute an
assignment on the first HB?
I am worries that there might be some race condition that is not covered.
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