The purpose of this work is to propose a performance model regarding the execution of reading and writing operations found in one of the most used Big Data replication architectures, the Master/Slave architecture, which is based on the usage of the class of Generalized Stochastic Petri Nets. ...
大意是Redis作为slave时默认会无视maxmemory参数,这样可以保证主从的数据始终保持一致。当master/slave实际数据大小均小于其maxmemory设置时,这个参数没有任何影响,而这次丢失数据的原因正是因为主机B重启后作为slave时maxmemory(3GB)小于实际数据大小(6GB+),此时replica-ignore-maxmemory 默认开启保证作为slave时直接无视maxmem...
mysqldump -uroot -p --master-data=2 --single-transaction --all-databases --log-error=all.log >alldatabases.sql mysql> GRANT REPLICATION SLAVE ON *.* TO 'slaveuser'@'%' identified by 'mima123456'; 4、从库导入,需要先把alldatabases.sql从主库拷贝到从库,再进行复制的配置 [root@mydb2 ~]...
InnoDB with transactions, you should use innodb_flush_log_at_trx_commit=1 and sync_binlog=1 in the master my.cnf file. Ensure that the skip-networking option is not enabled on your replication master. If networking has been disabled, the slave cannot communicate with the master and replicati...
根据slave中的日志信息,可以看到,当前slave中已经开启了relay-log日志,其对应文件信息就是xxxxx-relay-bin。其内部保存的就是slave中的相关binlog信息和pos位置信息。 同时在slave中也已经开启了SQL Thread,并且根据信息可以,它会从7375d7dd3ef6-relay-bin.000001文件的4位置开始复制。 同时在slave中也开启了IO Thr...
Generally speaking, database replication can operate in one of two modes: Master/slave replication, which is what MySQL uses. In this mode, all writes must be routed to a single "master" server, and all of the replica databases receive a feed of changes from the master. This doesn't su...
在Master服务器上建立用于Slave服务器复制数据的帐户 [root@master ~]# mysql mysql> grant replication slave,replication client on *.* to 'allentuns'@'192.168.2.200' identified by '1234@6@'; Query OK, 0 rows affected (0.02 sec) mysql> flush privileges; ...
mysql> grant replication slave,file on *.* to 'repl'@'192.168.15.235' identified by 'repl'; Master-B mysql> grant replication slave,file on *.* to 'repl'@'192.168.15.233' identified by 'repl'; u 配置master的my.cf文件 配置master-A的my.cf文件 ...
To clarify, I don't think that the semantical meaning is actually useful. Master-slave is totally bad at describing the two roles, but everybody understand what it is about, because in replication context you give to the words such meaning. ...
But ,After stop master, two slaves show status: Running, no have slave elected as a new master, and /tmp/mrm.log is empty. In addition, when master down, If execute MRM 0.6 command line at below , failover OK /usr/local/bin/replication-manager --user=root:123456 --rpluser=rep_user...