Showing entries 31 to 40 of 450
« 10 Newer Entries | 10 Older Entries »
Displaying posts with tag: MySQL Cluster (reset)
Preliminary MySQL Cluster benchmark results on POWER8

Yesterday, I got the basics going for MySQL Cluster on POWER. Today, I finished up a couple more patches to improve performance and ran some benchmarks.

This is on a 3.7Ghz POWER8 machine with non-balanced memory (only 2 of the 4 NUMA nodes have memory, so we have less total memory bandwidth than we could have, plus I’m going to bind ndbmtd to the CPUs in these NUMA nodes)

With a setup of a single replica and two data nodes on the one machine (each bound to a specific NUMA node), running the flexAsync benchmark on MySQL Cluster 7.3.7, I could get around:

  • 3.2 million reads/sec
  • 2.6 million deletes/sec
  • 2.4 million updates/sec
  • 2.4 million inserts/sec.

So, that’s at least in the right ballpark for a first go.

(I’m running this on a big endian host …

[Read more]
MySQL Cluster on POWER8

So, I’ve written previously on MySQL on POWER, and today is a quick bit of news about MySQL Cluster on POWER – specifically MySQL Cluster 7.3.7.

I ran into three main issues in getting some flexAsync benchmark results. One of them was the fact that I wanted to do this in the middle of all the POWER8 machines I usually use moving buildings (hard to run benchmarks when computers are packed up in boxes on a truck).

The next issue was that ndbmtd (the multi-threaded data node) needs memory barriers for the magic message passing stuff between threads. So, that’s pretty easy (about an eight line patch).

The next issue was in the results from flexAsync, it turns out 32bit math is a bad idea with results from my POWER8 box.

My preliminary performance numbers are fairly promising (actually… what is the world record for a single machine and NDB these days? Single data node?). I think there’s a bit more low …

[Read more]
Active-Active Replication, Performance Improvements & Operational Enhancements – some of what’s available in the new MySQL Cluster 7.4.2 DMR

Oracle have just made availble the new MySQL Cluster 7.4.2 Development Milestone Release – it can be downloaded from the development release tab here. Note that this is not a GA release and so we wouldn’t recommend using it in production.

This is the second DMR for MySQL 7.4; the delta between this DMR and 7.4.1 can be viewed in the MySQL Cluster 7.4.2 Release Notes

There are three main focus areas for this DMR and the purpose of this post is to briefly introduce them:

  • Active-Active (Multi-Master) Replication
  • Performance
  • Operational improvements (speeding up of restarts; enhanced …
[Read more]
Active-Active Replication, Performance Improvements & Operational Enhancements – some of what’s available in the new MySQL Cluster 7.4.1 DMR

Oracle have just made availble the new MySQL Cluster 7.4.1 Development Milestone Release – it can be downloaded from the development release tab here. Note that this is not a GA release and so we wouldn’t recommend using it in production.

There are three main focus areas for this DMR and the purpose of this post is to briefly introduce them:

  • Active-Active (Multi-Master) Replication
  • Performance
  • Operational improvements (speeding up of restarts; enhanced memory reporting)

Active-Active (Multi-Master) Replication

MySQL Cluster allows bi-directional replication between two (or more) clusters. Replication within each cluster is synchronous but between clusters it is asynchronous which means …

[Read more]
Webinar Replay & Slides: Performance Tuning of HAProxy for Database Load Balancing

September 11, 2014 By Severalnines

 

Thanks to everyone who attended and participated in this week’s webinar on ‘Performance Tuning of HAProxy for Database Load Balancing’. And special thanks to our guest speaker, Baptiste Assmann of HAProxy Technologies. 

 

If you missed the sessions or would like to watch the webinar again & browse through the slides, they are now available online.

 

Watch the replay of this webinar to learn about what HAProxy can tell you about your application and database instances. And understand the difference between short-lived connections and persistent connections, and how they affect the performance and availability of your applications. 

 

Watch the replay Performance …

[Read more]
Puppet Module for ClusterControl - Adding Management and Monitoring to your Existing Database Clusters

September 10, 2014 By Severalnines

If you are automating your infrastructure using Puppet, then this blog is for you. We are glad to announce the availability of a Puppet module for ClusterControl. For those using Chef, we already published Chef cookbooks for Galera Cluster and ClusterControl some time back.  

 

 

ClusterControl on Puppet Forge

 

The ClusterControl module initial release is available on Puppet Forge, installing the module is as easy as:

$ puppet module install severalnines-clustercontrol

 

If you haven’t change the default module path, this module will be installed under /etc/puppet/modules/clustercontrol on …

[Read more]
Putting MySQL Cluster in a container

To get more familiar with docker and to create a test setup for MySQL Cluster I created docker images for the various components of MySQL Cluster (a.k.a. NDB Cluster)

At first I created a Fedora 20 container and ran all components in one container. That worked and is quite easy to setup. But that's not how one is supposed to use docker.

So I created Dockerfile's for all components and one base image.

The base image:

  • contains the MySQL Cluster software
  • has libaio installed
  • has a mysql user and group 
  • serves as a base for the other images

The management node (ndb_mgmd) image:

  • Has ndb_mgmd as entrypoint
  • Has a config.ini for the cluster …
[Read more]
NDB – Forced node shutdown completed. Caused by error 2341: ‘Internal program error (failed ndbrequire)

recently while working on MySQL cluster 7.3.5, we came across this error

Forced node shutdown completed. Caused by error 2341: 'Internal program error (failed ndbrequire)(Internal error, programming error or missing error message, please report a bug). Temporary error, restart node'.

The management nodes would start up but

the data nodes would complete phase 1 & shutdown, some times at phase 2 and some times at phase 5.

The error one would see in the trace file would be as follows:

Status: Temporary error, restart node
Message: Internal program error (failed ndbrequire) (Internal error, programming error or missing error message, please report a bug)
Error: 2341
Error data: CREATE_TABLE_REF
Error object: NDBCNTR (Line: 2493) 0x00000003
Program: ndbd

How did we resolve it ?

First, few of our data nodes had an incorrect connect-string

Second, we had pre-assigned NodeGroups for the …

[Read more]
Picking the Right Clustering for MySQL: Cloud-only Services or Flexible Tungsten Clusters? New webinar-on-demand

As businesses head into the cloud, it is tempting to reach for the first product that offers to make database operation as simple as punching a few buttons on a menu.  However, there’s a big difference between firing up cloud database services such as Amazon RDS for testing or development and finding a solution that can handle hundreds of millions of transactions daily. This webinar-on-demand

MySQL Cluster latest developments – webinar replay + Q&A

I recently hosted hosting a webinar which explained what MySQL Clusrter is, what it can deliver and what the latest developments were. The “Discover the latest MySQL Cluster Developments” webinar is now available to view here. At the end of this article you’ll find a full transcript of the Q&A from the live session.

Details:

View this webinar to learn how MySQL Cluster 7.3, the latest GA release, enables developer agility by making it far simpler and faster to build your products and web-based applications with MySQL Cluster. You’ll also learn how MySQL Cluster and its linear scalability, 99.999% uptime, real-time responsiveness, and ability to perform over 1 BILLION Writes per Minute can …

[Read more]
Showing entries 31 to 40 of 450
« 10 Newer Entries | 10 Older Entries »