The other day, I was discussing high availability (HA) with other people.  The discussion was going in the direction of, as the application was only using INSERT ... ON DUPLICATE KEY UPDATE (ODKU) and traffic could be replayed, promoting a slave in case of the failure of the master was easy: replaying traffic would make all the slaves converge back to a common state.  It looks as this could work but it might not be as simple.  Before going into the details, let's take a step back and look into HA in general.

tl;dr: be careful when using row-based replication when replicating ODKU as slaves will stop replicating if a row is present on the master and missing on slave (or vice-versa).

High Availability by Promoting a Slave as the new Master
Let's suppose we are working …

August 6, 2014 By Severalnines

Well over a thousand sessions have been submitted for the OpenStack Summit and two of them includes our good selves! We’ve submitted two talks with partners of ours: 

• ClusterControl: Efficient and reliable MySQL Management, Monitoring, and Troubleshooting for OpenStack HA)
• Deploying Databases for OpenStack

… and would love it if the talks were included in the final agenda. For that to happen, we need a few more of your votes today!

The OpenStack Summit is a five-day conference for developers, users, and …

The binary and source versions of MySQL Utilities/MySQL Fabric have now been made available at http://dev.mysql.com/downloads/utilities/.

This release contains bug fixes and minor enhancements – full details can be found in the MySQL Fabric/MySQL Utilities release notes.

Im giving some talks this year:

MySQL Hochverfügbar mit Galera

Location: FrOSCon

About: Learn about Galera and deploy it using LXC and Ansible

LBaaS-Loadbalancer as a Service

Place: GUUG Frühjahrsgespräche

Topic: It is a workshop ( together with Jan Walzer and Jörg Jungermann). We are going to show how to use LXC to provide slim loadbalancers.

Medley der Containertechniken

Place: GUUG Frühjahrsgespräche

Topic: Learn about all the basic techniques vanilla based Container technology uses/shares (Namespaces, Cgroups und Chroot). Have a look at some of them (LXC, Libvrit, systemd-nspawn and Docker)

MySQL Replikation: Von den Anfängen in die Zukunft

Place: DOAG 2014

Topic: Learn about the past and the future of MySQL (and MariaDB) replication.

MySQL Cluster enables high availability by storing data replicas on multiple hosts. MySQL Cluster maintains connections between data nodes by using high-speed interconnects over TCP/IP - standard or direct connections - or SCI (Scalable Coherent Interface) sockets.

To learn more about MySQL Cluster, take the MySQL Cluster training course.

This course is currently scheduled for the following locations:

On 19th June 2014, Mats Kindahl and I presented a free webinar on why and how you should be using MySQL Fabric to add Sharding (scaling out reads & writes) and High Availability to MySQL. The webinar replay is available here. This blog post includes a transcript of the questions raised during the live webinar together with the responses given – if you’re questions aren’t answered already then please feel free to post them as comments here.

Abstract

MySQL Fabric is built around an extensible and open source framework for managing farms of MySQL Servers. Currently two features have been implemented – High Availability (built on top of MySQL Replication) and …

On Thursday (19th June), Mats Kindahl and I will be presenting a free webinar on why and how you should be using MySQL Fabric to add Sharding (scaling out reads & writes) and High Availability to MySQL. This product has only recently gone GA and so this is a good chance to discover it’s for you and to get your questions answered by the people who wrote the software! All you need to do is register for the MySQL Fabric webinar here.

Abstract

MySQL Fabric is built around an extensible and open source framework for managing farms of MySQL Servers. Currently two features have been implemented – High Availability (built on top of MySQL Replication) and scaling out using …

MySQL Fabric is a new framework that automates High Availability (HA) and/or sharding (scaling-out) for MySQL and it has just been declared Generally Available.

This post focuses on MySQL Fabric as a whole – both High Availability and scaling out (sharding). It starts with an introductions to HA and scaling out (by partitioning/sharding data) and how MySQL Fabric achieves it before going on to work through a full example of deploying HA with MySQL Fabric and then adding sharding on top.

Download and try MySQL Fabric now!

This post focuses on MySQL Fabric as a whole – both High Availability and scaling out (sharding). It starts with introductions to HA and scaling out (by partitioning/sharding data) and how MySQL Fabric achieves it …

The first version of MySQL Cluster 7.4 has now been released on MySQL Labs. Note that labs loads are not suitable for production use (in fact they’re even less mature than Development Milestone Releases); their purpose is to give users a chance to see what’s in the works, try it for themselves and then provide feedback. Having read that, if you’d like to try it out then Download MySQL Cluster 7.4 from MySQL Labs.

The focus of this first Cluster 7.4 load is performance and data node restart times.

Performance

MySQL Cluster was designed from the outset to be a distributed, in-memory database and …

We recently hosted a live webinar covering advanced MySQL Replication topics as well as the latest developments. The webinar charts and replay are now available here. Below, you’ll find the questions raised by the audience together with the responses given.

More details on what was covered…

The biggest Web sites in the world rely on MySQL Replication to scale-out and provide High Availability for their data. Extend your knowledge of how MySQL Replication works and what you can achieve with it; join us for this technical webinar to explore some of the more advanced replication architectures as well as some of the latest product developments:

• Replication …