What should I do if MySQL replication fails?

What should I do if MySQL replication fails?

If the MySQL master fails, replication breaks and the slave will need to switch to another master. You will need to promote the most updated slave node to be a master, and manually determine a new binary log file and position of the last transaction executed by the slave.

How are replication threads implemented in MySQL server?

MySQL replication capabilities are implemented using three threads, one on the master server and two on the slave: Binlog dump thread. The master creates a thread to send the binary log contents to a slave when the slave connects. This thread can be identified in the output of SHOW PROCESSLIST on the master as the Binlog Dump thread.

Which is the default replication scheme in MySQL?

MySQL Replication by default is asynchronous. This is the oldest, most popular and widely deployed replication scheme. With asynchronous replication, the master writes events to its binary log and slaves request them when they are ready. There is no guarantee that any event will ever reach any slave.

Why does MySQL failover from master to slave?

Slave can be arbitrarily behind master in reading or applying changes. If the master crashes, transactions that it has committed might not have been transmitted to any slave. Consequently, failover from master to slave in this case may result in failover to a server that is missing transactions relative to the master.

How is replication used in MySQL workloads?

Replication enables data from one MySQL server (the master) to be replicated to one or more MySQL servers (the slaves). MySQL Replication is very easy to setup, and is used to scale out read workloads, provide high availability and geographic redundancy, and offload backups and analytic jobs.

How does semi synchronous replication work in MySQL?

MySQL also supports semi-synchronous replication, where the master does not confirm transactions to the client until at least one slave has copied the change to its relay log, and flushed it to disk.

How to do disaster recovery for MySQL on Compute Engine?

This blog shows one approach of deploying a database architecture that implements high availability and disaster recovery for MySQL on Compute Engine, using regional disks as well as load balancers. Any database architecture must provide approaches to tolerate errors and recover from those errors quickly without losing data.

Which is better MySQL master or slave replication?

The master-slave replication is one of the most popular configurations of database replication. However, it is the master-master replication that has proven to be advantageous by enabling read/write operations from multiple servers. In this blog post, we will discuss how to perform MySQL master master replication.