Category Archives: Group Communication System

Configuring the communication protocol in Group Replication

In a previous blog post we presented the message fragmentation functionality that you can use starting with MySQL Group Replication 8.0.16.

No group member can have a version < 8.0.16 if you wish to use message fragmentation in a group. MySQL 8.0.16 also ships with a new Group Replication concept to help you ensuring backwards compatibility: the group’s communication protocol.…

Enhanced support for large transactions in Group Replication

MySQL 8.0.16 is out and it enhances Group Replication as usual. For example, the group_replication_exit_state_action system variable has a new default value, and members that the group expels can now automatically try to rejoin. This post presents a new feature MySQL 8.0.16 brings to Group Replication: message fragmentation.…

MySQL 8.0.16 Replication Enhancements

MySQL 8.0.16 has been released last Thursday. In it, you can find some new replication features. Here is a quick summary. Follow-up blog posts will provide details about these features.

  • Large Messages Fragmentation Layer for Group Replication. Tiago Vale’s work, introduces message fragmentation to the Group Communication Framework.

IPv6 support in Group Replication

In 8.0.14, we add to Group Replication (GR) the ability to use IPv6 in all of its network-related configuration parameters. This means that now you can take advantage of this technology and “rock” those billion addresses using MySQL Group Replication.

What’s New

When you operate a Group Replication group, some variables use network addresses, mainly:

  • group_replication_local_address;
  • group_replication_ip_whitelist
  • group_replication_group_seeds;
  • group_replication_force_members.

Group Replication now interacts with the Group Communication Engine more efficiently

MySQL 8.0.14 comes with a plethora of new features. Some of the new Group Replication features have userfacing 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.…

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.…

More P_S Instrumentation for Group Replication

In order to improve observability and manageability of MySQL Group Replication (GR), we enhanced its instrumentation in MySQL 8.0.4. With these goals in mind, we have extended the usage of Performance Schema (P_S) from this plugin to the included Group Communication System (GCS) module as well as its submodule eXtended Communications (XCom) which are responsible for all communication involved in the dissemination of transactions to other MySQL instances.…

Order from Chaos: Member Coordination in Group Replication

We are very excited about the next release of MySQL Group Replication 0.9.0 in MySQL 5.7.15 and the great work that has been done to improve its stability. Release after release, MySQL Group Replication becomes more stable and more user-friendly and has reached a maturity level that made us declare 0.9.0 a release candidate.…