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rptest: fix max_connections swarm sizing for librdkafka >= 2.10.0 #30848

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travisdowns merged 1 commit into from
Jun 18, 2026
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rptest: fix max_connections swarm sizing for librdkafka >= 2.10.0 #30848

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9 changes: 6 additions & 3 deletions tests/rptest/redpanda_cloud_tests/omb_validation_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -317,9 +317,12 @@ def assert_no_rejected():
(tier_limits.max_connections_count - omb_connections) * 1.1
)

# we expect each swarm producer to create 1 connection per broker, plus 1 additional connection
# for metadata
conn_per_swarm_producer = self.num_brokers + 1
# We expect each swarm producer to hold one connection per broker. Older librdkafka also kept a
# separate persistent connection to the bootstrap broker (the historical "+ 1"), but librdkafka
# removed it in v2.10.0 (confluentinc/librdkafka#4557): brokers are now keyed by id rather than
# host:port, so the bootstrap entry is merged into the learned broker list. client-swarm bundles
# librdkafka >= 2.10.0, so a producer holds exactly num_brokers connections.
conn_per_swarm_producer = self.num_brokers

producer_per_swarm_node: int = (
swarm_target_connections // conn_per_swarm_producer // SWARM_WORKERS
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