I've seen this error and gave it more tests, and then found that it failed about per 15 times: ``` Failure: test_rc_other_store_cmd(ClusterReplicationTest) /roma/test/t_replication.rb:259:in `test_rc_other_store_cmd' 256: v += 1 257: } 258: assert_equal("EXISTS", res) => 259: assert_equal(4, @rc_replica.get("cnt")) 260: end 261: 262: def test_rc_background_copy_activate <4> expected but was <2> === ``` I'll keep tracing this, but since the rate is low, I may firstly add more assertion in ROMA code to gather more information.