MySQL 8.0.14 comes with a plethora of new features. Some of the new Group Replication features have user–facing options, some impact user-facing options, and others stay completely under the hood. This post will present one of the under-the-hood changes in MySQL 8.0.14: the way the Group Replication layer interacts with the underlying Group Communication Engine layer, XCom.…
Category Archives: Replication
Group Replication: Preventing stale reads on primary fail-over!
This is a follow up post about the new consistency option of Group Replication group_replication_consistency. We recommend that you first read this post to get an overview of scenarios that can be addressed with this solution.
A group replication cluster will automatically detect failures and adjust the view of the members that are active, i.e., the membership configuration.…
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.…
How to manually decrypt an encrypted binary log file
The encrypted binary log file format introduced in MySQL version 8.0.14 was designed to allow a “manual” decryption of the file data when the value of the key that encrypted its file password is known.
Each encrypted binary (or relay) log file is composed by an encrypted binary log file header and the encrypted binary log content (the file data).…
Binary log encryption at rest
Starting in version 8.0.14, MySQL server can encrypt all new binary and relay log files on disk. In order to do so, you just need to enable the new binlog_encryption option (and also ensure that you have a keyring).…
MySQL 8.0.14 Replication Enhancements
MySQL 8.0.14 is out and it contains some new and very interesting replication enhancements. As always, we are very pleased to share with you the details about the exciting new features in this release.
This blog post will provide you a summary of the features and subsequent blog posts will dive into the mechanics and details of each one.…
Extending replication instrumentation: an insight on transaction retries
MySQL 8.0.13 improves replication lag monitoring by extending the instrumentation for transaction transient errors. These temporary errors, which include lock timeouts caused by client transactions executing concurrently as the slave is replicating, do not stop the applier thread: instead, they cause a transaction to retry.…
Group Replication: coping with unreliable failure detection
Failure detection is a cornerstone of distributed systems as it determines which components are working properly or not, allowing it to tackle both network and host instabilities and failures. Like many other distributed systems, Group Replication (GR) requires a majority of correctly operating group members to work properly.…
On-demand primary election
Having a server acting as a primary with multiple secondaries is the most common setup when using Group Replication. Until now though, there was no way to change the current primary member while the group was running without causing some sort of disruption.…
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.…