Kafka日志：
broker 133 received LeaderAndIsrRequest with correlation id 1 from controller 132 epoch 35 fro partition [__consumer_offsets,13] but cannot become follower since the new leader -1 is unavailable
this server is not the leader for that topic-partition
对于broker 133 received LeaderAndIsrRequest with correlation id 1 from controller 132 epoch 35 fro partition [__consumer_offsets,13] but cannot become follower since the new leader -1 is unavailable
错误是因为
因其中一个broker挂掉无法获取leader的brokerid
但3个broker中的其中一个挂掉，是可以将数据写入另外两个broker的。至于没有写入另外两个broker报错org.apache.kafka.common.errors.NotLeaderForPartition可能是因为可能我们的producer端的代码里没加 reties 参数，默认就发送一次，遇到leader选举时，找不到leader就会发送失败，造成程序停止
解决办法
producer端加上参数 reties=3， 重试发送三次（默认100ms重试一次 由 retry.backoff.ms控制）；
如果还需要保证消息发送的有序性，记得加上参数 max.in.flight.requests.per.connection = 1 限制客户端在单个连接上能够发送的未响应请求的个数，设置此值是1表示kafka broker在响应请求之前client不能再向同一个broker发送请求。（注意：设置此参数是为了满足必须顺序消费的场景，比如binlog数据）
