Fix flaky test #8
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This commit fixes the flaky test "ActiveRecord::DebugErrors::DisplayConnectionOwners#execute when ActiveRecord::LockWaitTimeout occurs displays transactions and processlist." I suspect there is more than 1 second time delay between the start time of the two threads, and CyclicBarrier shortens the delay.
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This PR fixes the flaky test "ActiveRecord::DebugErrors::DisplayConnectionOwners#execute when ActiveRecord::LockWaitTimeout occurs displays transactions and processlist."
I suspect there is more than 1 second time delay between the start time of the two threads, and CyclicBarrier is expected to shorten the delay.