Group Replication – Consistent Reads Deep Dive

On previous posts about Group Replication consistency we:

  1. introduced consistency levels;
  2. explained how to configure the primary failover consistency;
  3. presented how to configure transaction consistency levels to achieve the consistency required by your applications.

In blog 3. we presented the consistency levels: EVENTUAL, BEFORE, AFTER and BEFORE_AND_AFTER; their scopes: SESSION, GLOBAL; and their context: whether they only impact the ongoing transaction or all concurrent transactions.…

Group Replication – Consistency Levels

The MySQL Group Replication (GR) feature is a multi-primary update anywhere or single-primary replication plugin for MySQL with built-in conflict detection and resolution, automatic distributed recovery, and group membership.

Its goal it is to make high-availability (HA) simple with off-the-shelf hardware, not only to new applications but also existing ones – that was one of the motivations of the single-primary mode.…

Setting up MySQL Group Replication with MySQL Docker images

MySQL Group Replication (GR) is a MySQL Server plugin that enables you to create elastic, highly-available, fault-tolerant replication topologies. Groups can operate in a
single-primary mode with automatic primary election, where only one server accepts updates at a time. Alternatively, groups can be deployed in multi-primary mode, where all servers can accept updates, even if they are issued concurrently.…

Protecting your data – Part II: Preventing unwanted data changes on Group Replication members by asynchronous replication channels

Further to our earlier blog post about Fail-safe enhancements to Group Replication, where we discussed enhancements against data modification in members which are not ONLINE, we now present here additional changes to protect data from being accidentally modified by asynchronous replication channels.…

Group Replication Features backported to MySQL 5.7

We have brought further enhancement to MySQL Group Replication 5.7 release by backporting some most requested features to MySQL 5.7.20 release:

  • Member weight for automatic primary election on failover
  • Disallow writes after leaving the group

And to MySQL 5.7.19 release:

  • Transaction savepoint support

 

Member weight for automatic primary election on failover

The Member weight for automatic primary election on failover feature will allow user to influence primary member election using a integer member weight value.…