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从库信息：
- 33570:S 26 Aug 2019 13:24:06.544 * Master replied to PING, replication can continue...
- 33570:S 26 Aug 2019 13:24:06.544 * Trying a partial resynchronization (request b9e0f41a523e078a6a88ae274f204777775ab4dc:7603).
- 33570:S 26 Aug 2019 13:24:06.545 * Full resync from master: d41f950be7593a93620b1fd872b7552668f0b355:0
- 33570:S 26 Aug 2019 13:24:06.545 * Discarding previously cached master state.
- 33570:S 26 Aug 2019 13:24:06.601 * MASTER <-> REPLICA sync: receiving 240 bytes from master
- 33570:S 26 Aug 2019 13:24:06.601 * MASTER <-> REPLICA sync: Flushing old data
- 33570:S 26 Aug 2019 13:24:06.601 * MASTER <-> REPLICA sync: Loading DB in memory
- 33570:S 26 Aug 2019 13:24:06.601 * MASTER <-> REPLICA sync: Finished with success
从库接收主数据库缓存，并刷新缓存数据。
场景一：从库关机
从库关机：
- 127.0.0.1:6382> shutdown
- not connected>
主数据库信息：
- 34781:M 26 Aug 2019 13:24:06.701 * Synchronization with replica 127.0.0.1:6382 succeeded
- 34781:M 26 Aug 2019 13:29:45.037 # Connection with replica 127.0.0.1:6382 lost.
- # Replication
- role:master
- connected_slaves:1
- slave0:ip=127.0.0.1,port=6380,state=online,offset=546,lag=1
可以在主库看出，目前存活的从数据库只有一个
主数据库写入缓存：
- 127.0.0.1:6379> set slavetest 0851
- OK
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