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,…
Tag Archives: MySQL Group Replication
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.…
Group Replication – Consistent Reads Deep Dive
On previous posts about Group Replication consistency we:
- introduced consistency levels;
- explained how to configure the primary failover consistency;
- 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 – Consistent Reads
As we showed on the introduction post, in MySQL 8.0.14 Group Replication was once again improved. Now the developer can specify which is the consistency level of all group transactions or even of a single transaction.
Note that this is about consistency in terms of the global synchronization of transactions in the group.…
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.…
Extending replication instrumentation: account for memory used in XCom
Version 8.0.12 added many great new features to MySQL. One of the new features included is the memory instrumentation of the XCom cache, which allows users to view and monitor the memory utilization of the cache by querying Performance Schema (PS).…
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.…
Performance Evaluation: MySQL 5.7 Group Replication (GA Release)
Great news: Group Replication is now officially released with MySQL 5.7.17, congratulations to everybody that worked so hard for it!
In this post I plan to share more details about the performance of Group Replication while addressing one of our frequently asked questions, which is how it performs compared to Galera.…
MySQL Group Replication : It’s in 5.7.17 GA!
Extremely exciting news! A big day today. In case you have missed it, MySQL Group Replication has made it into the MySQL 5.7.17 release. Thus, it is now GA.
The MySQL Group Replication feature is a multi-master update anywhere replication plugin for MySQL with built-in conflict detection and resolution, automatic distributed recovery, and group membership.…
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…