1、repl_backlog_buffer:就是上面我解释到的,它是为了从库断开之后,如何找到主从差异数据而设计的环形缓冲区,从而避免全量同步带来的性能开销。如果从库断开时间太久,repl_backlog_buffer环形缓冲区被主库的写命令覆盖了,那么从库连上主库后只能乖乖地进行一次全量同步,所以repl_backlog_buffer配置尽量大一些,可以降...
第二阶段(命令传播),主要是增量传输,此时replication_backlog_buffer出场。 2.replication_backlog_buffer的使用场景 当主从全量rdb后,master会把rdb通信期间收到新的数据的操作命令,写入 replication buffer,同时也会把这些数据操作命令也写入 repl_backlog_buffer 这个缓冲区,它里面保存着最新传输的命令。 如果从节点...
1. 一个从库如果和主库断连时间过长,造成它在主库repl_backlog_buffer的slave_repl_offset位置上的数据已经被覆盖掉了,此时从库和主库间将进行全量复制。2. 每个从库会记录自己的slave_repl_offset,每个从库的复制进度也不一定相同。在和主库重连进行恢复时,从库会通过psync命令把自己记录的slave_repl_offset...
* seconds (in the meantime the slave would block). *//* 连接测试,将由主客户端发送PING命令给从客户端,在给定的延迟时间内观察是否有回复 */if(server.repl_state == REDIS_REPL_CONNECTING) {redisLog(REDIS_NOTICE,"Non blocking connect for SYNC fired the event.");/* Delete the writable event ...
When you see repl_backlog those are only for PSYNC. So, they could probably be named psync_buffer for the same effect. repl_backlog_size is the capacity of a buffer holding data for PSYNC. repl_backlog_histlen is how much actual data is in the PSYNC buffer. They will usually be equ...
client-output-buffer-limit slave 0 0 0WARNNING: this setting may run out of memory of redis server in some cases.5.3. Trace event logSet log level to debug If you are using log4j2, add logger like the following:<Logger name="com.moilioncircle" level="debug"> <AppenderRef ref="Your...
# Set the replication backlog size. The backlog is a buffer that accumulates # replica data when replicas are disconnected for some time, so that when a replica # wants to reconnect again, often a full resync is not needed, but a partial # resync is enough, just passing the portion of...
repl_backlog_size:backlog 的大小,默认值是1MB(1024*1024),可在配置文件中设置 (repl-backlog-size) repl_backlog_first_byte_offset:backlog 第一个字节的 offset 。在内核中是 server.repl_backlog_off (server.repl_backlog_off = server.master_repl_offset - server.repl_backlog_histlen + 1;) ...
(5)client-output-buffer-limit slave 256MB 64MB 60,如果在复制期间,内存缓冲区持续消耗超过64MB,或者一次性超过256MB,那么停止复制,复制失败 (6)slave node接收到rdb之后,清空自己的旧数据,然后重新加载rdb到自己的内存中,同时基于旧的数据版本对外提供服务 ...
client-output-buffer-limit pubsub 32mb 8mb 60 hz 10 slave的配置,在slave上开启rdb与aof slave 6379的配置: daemonize yes pidfile /var/run/redis_6379.pid port 6379 dbfilename redis.db dir /home/redis/6379 save 900 1 save 300 10