cadonna commented on a change in pull request #8613:
URL: https://github.com/apache/kafka/pull/8613#discussion_r420052853
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File path: tests/kafkatest/tests/streams/streams_upgrade_test.py
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@@ -532,20 +532,22 @@ def do_rolling_bounce(self, processor, counter,
current_generation):
log_monitor.wait_until("Sent a version 8 subscription
and got version 7 assignment back (successful version probing). Downgrade
subscription metadata to commonly supported version 7 and trigger new
rebalance.",
timeout_sec=60,
err_msg="Could not detect
'successful version probing' at upgrading node " + str(node.account))
- else:
- log_monitor.wait_until("Sent a version 8 subscription
and got version 7 assignment back (successful version probing). Downgrade
subscription metadata to commonly supported version 8 and trigger new
rebalance.",
+ log_monitor.wait_until("Detected that the assignor
requested a rebalance. Rejoining the consumer group to trigger a new
rebalance.",
Review comment:
We can leave it because it verifies whether the assignment was triggered
in the assignor, which is better than nothing. However, it does not give us any
guarantee that the rebalance took actually place.
I guess what we really would need is a way to check if a group stabilized
and if the assignment is valid. We try to do that by verifying that the
generations of the processors are synced. However, I ran into cases where all
processors had the same generation, but one processor did not have any tasks
assigned. So we would actually need to check if they have the highest
generation in sync across the processors AND if all processors have at least
one task assigned (AND if all tasks were assigned).
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