kafka leader选举

参考

https://blog.csdn.net/u014609111/article/details/116199553?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-0&spm=1001.2101.3001.4242

https://blog.csdn.net/lixiang987654321/article/details/99674419

2种leader
Controller leader选举是zk来实现的
Partition leader是controller来实现的