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什么是redis的集群脑裂?
redis的集群脑裂是指因为网络问题,导致redis master节点跟redis
slave节点和sentinel集群处于不同的网络分区,此时因为sentinel集群无法感知到master的存在,所以将slave节点提升为master节点。此时存在两个不同的master节点,就像一个大脑分裂成了两个。
集群脑裂问题中,如果客户端还在基于原来的master节点继续写入数据,那么新的master节点将无法同步这些数据,当网络问题解决之后,sentinel集群将原先的master节点降为slave节点,此时再从新的master中同步数据,将会造成大量的数据丢失。
解决方案
redis的配置文件中,存在两个参数
min-slaves-to-write 3 min-slaves-max-lag 10
第一个参数表示连接到master的最少slave数量
第二个参数表示slave连接到master的最大延迟时间
按照上面的配置,要求至少3个slave节点,且数据复制和同步的延迟不能超过10秒,否则的话master就会拒绝写请求,配置了这两个参数之后,如果发生集群脑裂,原先的master节点接收到客户端的写入请求会拒绝,就可以减少数据同步之后的数据丢失。
注意:较新版本的redis.conf文件中的参数变成了
min-replicas-to-write 3 min-replicas-max-lag 10
redis中的异步复制情况下的数据丢失问题也能使用这两个参数