Emanuele Sabellico created KAFKA-15997:
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Summary: Ensure fairness in the uniform assignor
Key: KAFKA-15997
URL: https://issues.apache.org/jira/browse/KAFKA-15997
Project: Kafka
Issue Type: Sub-task
Reporter: Emanuele Sabellico
Fairness has to be ensured in uniform assignor as it was in cooperative-sticky
one.
There's this test 0113 subtest u_multiple_subscription_changes in librdkafka
where 8 consumers are subscribing to the same topic, and it's verifying that
all of them are getting 2 partitions assigned. But with new protocol it seems
two consumers get assigned 3 partitions and 1 has zero partitions. The test
doesn't configure any client.rack.
{code:java}
[0113_cooperative_rebalance /478.183s] Consumer assignments
(subscription_variation 0) (stabilized) (no rebalance cb):
[0113_cooperative_rebalance /478.183s] Consumer C_0#consumer-3 assignment (2):
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [5] (2000msgs),
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [8] (4000msgs)
[0113_cooperative_rebalance /478.183s] Consumer C_1#consumer-4 assignment (3):
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [0] (1000msgs),
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [3] (2000msgs),
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [13] (1000msgs)
[0113_cooperative_rebalance /478.184s] Consumer C_2#consumer-5 assignment (2):
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [6] (1000msgs),
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [10] (2000msgs)
[0113_cooperative_rebalance /478.184s] Consumer C_3#consumer-6 assignment (2):
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [7] (1000msgs),
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [9] (2000msgs)
[0113_cooperative_rebalance /478.184s] Consumer C_4#consumer-7 assignment (2):
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [11] (1000msgs),
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [14] (3000msgs)
[0113_cooperative_rebalance /478.184s] Consumer C_5#consumer-8 assignment (3):
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [1] (2000msgs),
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [2] (2000msgs),
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [4] (1000msgs)
[0113_cooperative_rebalance /478.184s] Consumer C_6#consumer-9 assignment (0):
[0113_cooperative_rebalance /478.184s] Consumer C_7#consumer-10 assignment
(2): rdkafkatest_rnd24419cc75e59d8de_0113u_1 [12] (1000msgs),
rdkafkatest_rnd24419cc75e59d8de_0113u_1 [15] (1000msgs)
[0113_cooperative_rebalance /478.184s] 16/32 partitions assigned
[0113_cooperative_rebalance /478.184s] Consumer C_0#consumer-3 has 2 assigned
partitions (1 subscribed topic(s)), expecting 2 assigned partitions
[0113_cooperative_rebalance /478.184s] Consumer C_1#consumer-4 has 3 assigned
partitions (1 subscribed topic(s)), expecting 2 assigned partitions
[0113_cooperative_rebalance /478.184s] Consumer C_2#consumer-5 has 2 assigned
partitions (1 subscribed topic(s)), expecting 2 assigned partitions
[0113_cooperative_rebalance /478.184s] Consumer C_3#consumer-6 has 2 assigned
partitions (1 subscribed topic(s)), expecting 2 assigned partitions
[0113_cooperative_rebalance /478.184s] Consumer C_4#consumer-7 has 2 assigned
partitions (1 subscribed topic(s)), expecting 2 assigned partitions
[0113_cooperative_rebalance /478.184s] Consumer C_5#consumer-8 has 3 assigned
partitions (1 subscribed topic(s)), expecting 2 assigned partitions
[0113_cooperative_rebalance /478.184s] Consumer C_6#consumer-9 has 0 assigned
partitions (1 subscribed topic(s)), expecting 2 assigned partitions
[0113_cooperative_rebalance /478.184s] Consumer C_7#consumer-10 has 2 assigned
partitions (1 subscribed topic(s)), expecting 2 assigned partitions
[<MAIN> /479.057s] 1 test(s) running:
0113_cooperative_rebalance
[<MAIN> /480.057s] 1 test(s) running:
0113_cooperative_rebalance
[<MAIN> /481.057s] 1 test(s) running:
0113_cooperative_rebalance
[0113_cooperative_rebalance /482.498s] TEST FAILURE
### Test "0113_cooperative_rebalance (u_multiple_subscription_changes:2390:
use_rebalance_cb: 0, subscription_variation: 0)" failed at
test.c:1243:check_test_timeouts() at Thu Dec 7 15:52:15 2023: ###
Test 0113_cooperative_rebalance (u_multiple_subscription_changes:2390:
use_rebalance_cb: 0, subscription_variation: 0) timed out (timeout set to 480
seconds)
./run-test.sh: line 62: 3512920 Killed $TEST $ARGS
###
### Test ./test-runner in bare mode FAILED! (return code 137) ###
###{code}
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