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Displaying posts with tag: tungsten (reset)

Solving replication problems with Tungsten replicator
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On Monday afternoon, Neal Armitage and I will be speaking at Percona Live in London. It will be a three hours tutorial about Tungsten replicator.

The contents of this tutorial are mostly new. We have released recently a new and easier way of installing different topologies, in the shape of cookbook scripts, which are distributed with the replicator tarball.

Using this cookbook, any user can simply install multiple topologies, from the simple master/slave to all-masters, fan-in, and star.

There are recipes for showing the replication cluster, switching roles between master and a chosen slave, taking over MySQL replication, installing direct slaves with parallel replication, testing each topology, and

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Meet you in London - Percona Live MySQL Conference
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Continuent is proud to sponsor Percona Live MySQL Conference: London 2012!  Don't miss these five (5) talks by our database replication and clustering stars: Keynote: Future-Proofing MySQL for the World-Wide Data Revolution, by Robert Hodges Why, What, and How of Data Warehouses for MySQL, by Robert Hodges Multi-master, Multi-site MySQL Databases Made Easy with Continuent Tungsten, by Robert
Tungsten Replicator 2.0.6 released - Multi-Master replication made easy and more
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Tungsten Replicator version 2.0.6 was released today.

You can get both the binaries and the source code at the project's downloads page.

This release contains many bug fixes, and various improvements. All of them are listed in the Release Notes. The most interesting ones are the improvement in multi-master topologies. Using this release with star topologies you will get less traffic than before, because we have reduced some duplication of transaction history logs that were sent between servers.

And speaking of multi-master topologies, this release includes the cookbook recipes mentioned in this blog

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Slides for Evaluating MySQL HA Alternatives
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Attached are the slides for my MySQL Connect talk Evaluating MySQL High-availability alternatives, which I will present today at 14:30 at the MySQL Connect conference.

A bit unusually I'm posting the material ahead of the talk. The point of the talk is about evaluating each alternative from your own perspective. With that in mind, if you're at the talk with your own laptop, feel free to browse the slides at your own pace from here.

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Data Fabrics and Other Tales: Percona Live and MySQL Connect
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The fall conference season is starting.  I will be doing a number of talks including a keynote on "future proofing" MySQL through the use of data fabrics.  Data fabrics allow you to build durable, long-lasting systems that take advantage of MySQL's strengths today but also evolve to solve future problems using fast-changing cloud and big data technologies.  The talk brings together ideas that Ed Archibald (our CTO) and I have been working on for over two decades.  I'm looking forward to rolling them out to a larger crowd.

Here are the talks in calendar order.  The first two are at MySQL Connect 2012 in San Francisco on September 30th:



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Database Failure Is Not the Biggest Availability Problem
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There have been a number of excellent articles about the pros and cons of automatic database failover triggered by Baron's post on the GitHub database outage.  In the spirit of Peter Zaitsev's article "The Math of Automated Failover," it seems like a good time to point out that database failure is usually not the biggest source of downtime for websites or indeed applications in general.  The real culprit is maintenance.

Here is a simple table showing availability numbers out to 5 nines and what they mean in terms of monthly down-time.

Normal 0 false false



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Automated Database Failover Is Weird but not Evil
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Github had a recent outage due to malfunctioning automatic MySQL failover.  Having worked on this problem for several years I felt sympathy but not much need to comment.  Then Baron Schwartz wrote a short post entitled "Is automated failover the root of all evil?"  OK, that seems worth a comment:  it's not.  Great title, though.

Selecting automated database failover involves a trade-off between keeping your site up 24x7 and making things worse by having software do the thinking when humans are not around.  When comparing outcomes of wetware vs. software it is worth remembering that humans are not at their best when woken up at 3:30am.  Humans go on

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Joining the Continuent Team
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This month I have joined the team at Continuent. No stranger to the MySQL ecosystem, Continuent provides replication and clustering technology for managing data between MySQL, Oracle, PostgreSQL, Vertica and a growing list of data stores.

I have known many of the team at Continuent for some time, and will again be joining Giuseppe Maxia from our days at MySQL Inc/AB starting back in 2006.

I am looking forward to taking the hard work out of administration of MySQL systems with the simplicity of Continuent Tungsten, simplifying tasks including automatic failover, multi-master and geo cluster redundancy to a single command.

Catch me speaking at the upcoming

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Life in the Amazon Jungle
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In late 2011 I attended a lecture by John Wilkes on Google compute clusters, which link thousands of commodity computers into huge task processing systems.  At this scale hardware faults are common.  Google puts a lot of effort into making failures harmless by managing hardware efficiently and using fault-tolerant application programming models.  This is not just good for application up-time.  It also allows Google to operate on cheaper hardware with higher failure rates, hence offers a competitive advantage in data center operation.

It's becoming apparent we all have to think like Google to run applications successfully in the cloud.  At Continuent we run our IT and an increasing amount of QA and development on Amazon Web

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Is Synchronous Data Replication over WAN Really a Viable Strategy?
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Synchronous data replication over long distances has the sort of seductive appeal that often characterizes bad ideas.  Why wouldn't you want every local credit card transaction simultaneously stored on the other side of the planet far away from earthquake, storms and human foolishness?  The answer is simple: conventional SQL applications interact poorly with synchronous replication over wide area networks (WANs).

I spent a couple of years down the synchronous replication rabbit hole in an earlier Continuent product.  It was one of those experiences that make you a sadder but wiser person.  This article digs into some of the problems with synchronous replication and shows why another approach, asynchronous multi-master replication, is currently a better way to manage databases connected by

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