hi: so far kafka doesn't support reduce partition num for some reason, but sometimes we need to have this function to resolve some problems.
1. we have some topics with too many partitions(more than 1000) used 2 years, and lots of consumer groups subscribe them, now these topics impact system performance and stability badly, but it's hard to move groups to subscribe other topics. 2. assume we have a topic with 64 partitions,and a group with 32 servers consume it, so every server consume 2 partitions,but now these topic get more data and this group need more servers to handle these data, we should add another 32 servers, if not(less than 32), some servers will handle 1 partitions and left servers still handle 2 partitions. so we want to know how to resolve these problems? is it necessary to add function to reduce partitions? thx...
