In this post, we introduce a configuration option that controls whether replication channels allow the creation of tables without primary keys. This continues our recent work on replication security, where we allowed users to enforce privilege checks, and/or enforce row-based events.…
Category Archives: Replication
MySQL 8.0.20 Replication Enhancements
We have just released MySQL 8.0.20. And it has some interesting replication enhancements. In particular one big and exciting feature: binary log compression. Here is the list of things in this release:
- Binary Log Compression (WL#3549). This work done by Luís Soares implements binary log compression, making use of the popular compression algorithm ZSTD.
Preserving commit order on replicas with binary log disabled
MySQL 8.0.19 introduces Binlogless replicas with commit ordering which means you can deploy asynchronous replicas without binary logs enabled, and commit transactions in the same order they are replicated in. Yes, you can disable binlog (skip-log-bin) and the logging of changes done by the applier (log-slave-updates=FALSE) while at the same preserve commit order (slave-preserve-commit-order=TRUE).…
Restrict MySQL replication to row based events
In a follow-up to the work presented on MySQL 8.0.18 where we introduced privilege checks for slave applier threads, in this post we present a new feature to further increase your ability to securely replicate your data: you can now restrict replication streams to row based events only.…
MySQL 8.0.19 Replication Enhancements
Here comes another MySQL release, and together with it, a set of new replication features. As usual, we would like to summarize them. And, also as usual, follow up blogs will provide further details.
- Configure Replication Applier to Require Row-based Replication only.
Group Replication delivery message service
In the process of enhancing MySQL replication with new features for our users, we also improve the internals. A lot of work goes also to modernize the codebase and make it easier to maintain and obviously extend as well.
In MySQL 8.0.18,…
Automatic member fencing with OFFLINE_MODE in Group Replication
Group Replication enables you to create fault-tolerant systems with redundancy by replicating the system state to a set of servers. Even if some of the servers subsequently fail, as long it is not all or a majority, the system is still available.…
Replication with restricted privileges
Up until MySQL 8.0.18, the slave executes replicated transactions without checking privileges. It does so to be able to apply everything that its upstream server (the master) tells it to. In practice this means that the slave fully trusts its master.…
MySQL 8.0.18 Replication Enhancements
The latest MySQL 8.0 release is out. That is MySQL 8.0.18. We have some new replication enhancements and some work done on replication internals in this release that we would like to highlight and celebrate with our users. Here is a quick summary.…
Improved handling of different member versions in Group Replication
For optimal compatibility and performance, all members of a group should run the same version of MySQL Server and therefore of Group Replication. However, in some situations, it may be required to that a group contains servers running different versions. For example, during a rolling upgrade.…