From my experience, the bottle neck of a kafka cluster is the writing. (i.e. the producers) The most direct way to measure how “stressed” the writing threads are is to directly observe the producer purgatory buffer of your brokers. The larger it gets the more likely a leader will report an out of sync replica.
-David On 2/7/17, 7:45 PM, "Jiecxy" <253441...@qq.com> wrote: How to measure the load capacity of one broker or whole cluster? Or maximum throughput? For the quantity of broker, is there any multiple relationship? Such as the capacity of two brokers is twice as much as that of one broker?