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#77
实现思路：支持双向同步 · Issue #367 · tair-opensource/RedisShake (github.com)
1.将checkpoint独立出来放在到配置文件(syncCheckPointKey+filterCheckPointKey)。使用multi..exec +checkpoint对所有发送到目标端执行的命令进行标记。
2.识别特定的filterCheckPointKey，将指定的checkpoint进行过滤，消除回环，避免同步回原集群。
特别注意：
由于restore不经过multi..exec，配置双向同步的时候需要在config配置中过滤掉该命令
filter:
commandBlacklist:
- restore