Contents
How does delayed replication work in MariaDB server?
Delayed replication allows specifying that a replication slave should lag behind the master by (at least) a specified amount of time (specified in seconds). Before executing an event, the slave will first wait, if necessary, until the given time has passed since the event was created on the master.
What’s the difference between master and slave in MariaDB?
The terms master and slave have historically been used in replication, but the terms terms primary and replica are now preferred. The old terms are used throughout the documentation, and in MariaDB commands, although MariaDB 10.5 has begun the process of renaming. The documentation will follow over time.
Is there a way to disable delayed replication?
Delayed replication is enabled using the MASTER_DELAY option to CHANGE MASTER: A zero delay disables delayed replication. The slave must be stopped when changing the delay value. Three fields in SHOW SLAVE STATUS are associated with delayed replication:
What happens when the slave waits before executing an event?
Before executing an event, the slave will first wait, if necessary, until the given time has passed since the event was created on the master. The result is that the slave will reflect the state of the master some time back in the past.
Why is MySQL replication lagging behind the Master?
Most of the time the slave is lagging behind the master. When I run show processlist;, there is no query that’s taking a long time. I enabled slow_log as well. However, it does not find any slow running query. The slave is continuously giving alerts that replication is seconds behind the master. Sometimes, the lag time increases.
What are the new features of MariaDB 10?
One of my favorite new features of MariaDB 10 is parallel slave replication ( https://mariadb.com/kb/en/parallel-replication/ ). With earlier versions of MariaDB and MySQL, the slave runs in a single thread, and applies replication events serially.
Can you use MySQL 5.6 with MariaDB 10?
You wouldn’t be able to benefit from MySQL 5.6‘s multi-threaded replication if you only used one database. MariaDB 10‘s parallel replication utilizes group commit ( https://mariadb.com/kb/en/group-commit-for-the-binary-log/ ) to know which replication events can be applied in parallel on the slave.
Do you need mariabackup to set up a replication slave?
If you would like to use Mariabackup to set up a replication slave, then you might find the information at Setting up a Replication Slave with Mariabackup helpful. In general, when replicating across different versions of MariaDB, it is best that the master is an older version than the slave.