Orchestrator visual cheatsheet

June 5, 2015

Orchestrator is growing. Supporting automatic detection of topologies, simple refactoring of topology trees, complex refactoring via Pseudo-GTID, failure detection and automated discovery, it is becoming larger and larger by the day.

One of the problems with growign projects is hwo to properly document them. Orchestrator enjoys a comprehensive manual, but as these get more and more detailed, it is becoming difficult to get oriented and pointed in the right direction. I've done my best to advise the simple use cases throughout the manual.

One thing that is difficult to put into words is topologies. Explaining "failover of an intermediate master S1 that has S2,...,Sn slaves onto a sibling of S1 provided that..." is too verbose. So here's a quick visual cheatsheet for (current) topology refactoring commands. Refactoring commands are a mere subset of overall orchestrator commands, but they're great to play with and perfect for visualization.

The "move" and related commands use normal replication commands (STOP SLAVE; CHANGE MASTER TO; START SLAVE UNTIL;"...).

The "match" and related commands utilize Pseudo-GTID and use more elaborate MySQL commands (SHOW BINLOG EVENTS, SHOW RELAYLOG EVENTS).

So without further ado, here's what each command does (and do run "orchestrator" from the command line to get a man-like explanation of everything, or just go to the manual). Continue Reading »

"awesome-mysql" curated list created, open for pull requests

April 28, 2015

Following up on popular "awesome-*" lists (e.g. awesome-python, awesome-golang etc.), I've created the awesome-mysql curated list.

This is a list of technologies (and resources) in and around MySQL, and means to serve as a place to find reliable software and info. I recently happened to notice there are some tools I'm familiar with that are unknown to others; tools unknown to me that are in good use.

The list is naturally and intentionally incomplete. I wish this to be a community based creation; so I put some categories and some tools. I left many out, deliberatey. Please assist by filling in the missing projects, tools, libraries! Additions gladly accepted via pull-requests. Do note the contribution guidelines (somewhat lengthy, I apologize).

I will moderate FUDs, promotional, commercials etc., and otherwise it may take some days for me to merge requests.

The work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.

Percona Live 2015: Reflections

April 18, 2015

Some personal reflections on PerconaLive 2015:

Percona acquires Tokutek

Well done! Tokutek develops the TokuDB storage engine for MySQL and TokuMX engine for MongoDB. I will discuss the MySQL aspect only.

TokuDB was released as open source in 2013. It has attained a lot of traction and I have used it myself for some time. I met issues with locking or otherwise operational difficulties which I reported, and otherwise was fascinated by such features as great compression, online schema changes, and more.

Recently another company, InfiniDB, that also released its MySQL-backed codebase as open source, went out of business. I was afraid the same might happen to Tokutek.

I see Percona's purchase as a very good move for the community. I saw a lot of TokuDB interest in Percona for some time now, and it is clearly interested in the technology. I expect they will add their own hands-on experience into the development of more operations-friendly features; put effort in solving locking issues (it's been a while since I last checked, of course some of these may have been addressed by now). I am guessing they will work on a Galera/TokuDB integration and offer a "Toku-XtraDB-Cluster".

TokuDB can compete with InnoDB in many places, while in others each will have its distinct advantage.

I see this is as good news for the community.

Community Awards and Lightning Talks

On a completely different subject, I believe it is commonly accepted that this year's setup for the community awards & lightning talks was unsuccessful. The noise was astounding, human traffic was interrupting and overall this was a poor experience. We (Giuseppe Maxia, Kortney Runyan & myself) made a quick, informal brainstorming on this and came up with a couple ideas. One of which we hope to try in the upcoming Percona Live Europe - Amsterdam.

We apologize to the speakers for the difficulties.

Percona Live Europe - Amsterdam

Haha! Having recently relocated to the Netherlands I'm of course very happy. But regardless, Percona Live London was fun - and yet running on low fuel. I think it was a great idea to change location (and more locations expected in the future). This is the path taken by such conferences as OSCon, Velocity, Strata and more. Amsterdam in particular, as I've recently learned, is especially appreciated by many. I think this conf will do great!

Woz

And now for something completely different. Woz' talk was that. I'm happy he came; I appreciate that he discussed education; and it was fun.

Percona Live 2015: Reflections; the Apache CCLA offer

April 18, 2015

Facebook, Google, Twitter, LinkedIn, Alibaba, MariaDB, Percona team up and offer Oracle all public changes under the Apache CCLA

Read again please.

My one word summary of this is: Romantic. In the most positive sense.

Disclaimer: I am not a lawyer; this is my understanding of the current status and of the offer.

Summarizing the deal: the teams participating with WebScaleSQL would like to push code upstream. Current legal issues limit their options. Existing patches/contributions from Percona & MariaDB are licensed by GPLv2, which Oracle cannot import as it distributes a commercial, closed source, edition, in addition to its open source MySQL community edition.

So what happens is that there is a lot of free code, great patches, new features out there, that are only available via MariaDB or WebscaleSQL or Percona Server, but not in the Oracle MySQL code base. This, in turn, means Oracle re-implements many features originating from said companies. And, more importantly, said companies need to routinely rebase their code on new Oracle releases, repeating tedious work.

The offer is that Oracle agrees to the Apache CCLA as a license by which it would be able to incorporate contributions. Oracle would then be able to use incorporated code in both open source and commercial edition. Oracle will choose what code to incorporate; hopefully many patches will be accepted upstream, and the community will benefit from a rich featureset, rapid developed MySQL server.

Clearly a lot of work, persuasion, lawyer time, discussions etc. have been invested in this effort. I would like to add my humble +1/like/favorite/whathaveyou. You may add yours by letting Oracle know your opinion on the subject. Media tools are great for this.

 

 

MySQL Community Awards 2015: the Winners

April 18, 2015

The MySQL Community Awards initiative is an effort to acknowledge and thank individuals and corporates for their contributions to the MySQL ecosystem. It is a from-the-community, by-the-community and for-the-community effort. The committee is composed of an independent group of community members of different orientation and opinion, themselves past winners or known contributors to the community.

The 2015 community awards were presented on April 15rd, 2015, during the community event at the Percona Live conference. The winners are:

MySQL Community Awards: Community Contributor of the year 2015

  • Daniël van Eeden
    Daniël has done great work on MySQL security and has continued to fantastically support MySQL User Group.NL. He has also logged a lot of bugs (and submitted patches), across all sorts of different MySQL products and has done a great deal to help improve the quality of MySQL.Daniël consistently provides extremely good feedback, on a wide range of features and products, from MySQL server security, through InnoDB, partitioning, and even on other products such MySQL Enterprise Backup and MySQL Enterprise Monitor. His bugs are always reported with a high quality, and many times he even includes a contribution to fix those bugs.
  • Justin Swanhart
    Justin has worked tirelessly for the past few years on some amazing projects of his own design, Shard-Query and Flexviews. Cross shard aggregation is an extremely complex thing to get right, and Shard-Query takes an interesting approach at this. Flexviews provides a materialized view framework, which is something that MySQL lacks to many people's annoyance. Additionally Justin has also built some performance_schema related tools, reported many MySQL bugs, and has been a public speaker about MySQL in "can do" style.
  • Morgan Tocker
    In his day job, Morgan is Community Manager at Oracle. While some of his community interaction has been because of his job, he has gone far and beyond his corporate responsibilities. He is one of the most prolific writers on the MySQL Planet, he has been the most public face of MySQL, and he is always asking for feedback and showing a sincere concern for the Open Source community.For example, Morgan’s community polls on what defaults should be changed in MySQL 5.7 put some of the MySQL product decision making directly into the hands of the community. He is a key player on keeping the community and the MySQL developers at Oracle in touch with each other.

MySQL Community Awards: Application of the year 2015

Continue Reading »

Speaking at Percona Live: Pseudo GTID and Easy Replication Topology Management

March 31, 2015

In two weeks time I will be presenting Pseudo GTID and Easy Replication Topology Management at Percona Live. From the time I submitted the proposal a LOT has been developed, experimented, deployed and used with both Pseudo GTID and with orchestrator. In my talk I will:

  • Suggest that you skip the "to GTID or not to GTID" question and go for the lightweight Pseudo GTID
  • Show how Pseudo GTID is used in production to recover from various replication failures and server crashes
  • Do an outrageous demonstration
  • Tell you about 50,000 successful experiments and tests done in production
  • Show off orchestrator and its support for Pseudo GTID, including automated crash analysis and recovery mechanism.

I will further show how the orchestrator tooling makes for a less restrictive, more performant, less locking, non-intrusive, trusted and lightweight replication topology management solution. Continue Reading »

MySQL Community Awards 2015: Call for Nominations!

February 6, 2015

The 2015 MySQL Community Awards event will take place, as usual, in Santa Clara, during the Percona Live MySQL Conference & Expo, April 2015.

The MySQL Community Awards is a community based initiative. The idea is to publicly recognize contributors to the MySQL ecosystem. The entire process of discussing, voting and awarding is controlled by an independent group of community members, typically based of past winners or their representatives, as well as known contributors.

It is a self-appointed, self-declared, self-making-up-the-rules-as-it-goes committee. It is also very aware of the importance of the community; a no-nonsense, non-political, adhering to tradition, self criticizing committee.

The Call for Nominations is open. We are seeking the community’s assistance in nominating candidates in the following categories: Continue Reading »

Speaking at FOSDEM: Pseudo GTID and easy replication management

January 29, 2015

This coming Sunday I'll be presenting Pseudo GTID and easy replication management at FOSDEM, Brussels.

There's been a lot of development on Pseudo GTID these last few weeks. In this talk I'll show you how you can use Pseudo GTID instead of "normal" GTID to easily repoint your slaves, recover from intermediate master failure, promote slaves to masters as well as emply crash safe replication without crash safe replication.

Moreover, I will show how you can achieve all the above with less constraints than GTID, and for bulk operations -- with less overhead and in shorter time. You will also see that Pseudo GTID is a non intrusive solution which does not require you to change anything in your topologies.

Moral: I'll try and convince you to drop your plans for using GTID in favor of Pseudo GTID.

We will be employing Pseudo GTID as the basis for high availability and failover at Booking.com on many topologies, and as a safety mechanism in other topologies where we will employ Binlog servers.

Reading RBR binary logs with pt-query-digest

January 26, 2015

For purposes of auditing anything that goes on our servers we're looking to parse the binary logs of all servers (masters), as with "Anemomaster". With Row Based Replication this is problematic since pt-query-digest does not support parsing RBR binary logs (true for 2.2.12, latest at this time).

I've written a simple script that translates RBR logs to SBR-like logs, with a little bit of cheating. My interest is that pt-query-digest is able to capture and count the queries, nothing else. By doing some minimal text manipulation on the binary log I'm able to now feed it to pt-query-digest which seems to be happy.

The script of course does not parse the binary log directly; furthermore, it requires the binary log to be extracted via:

mysqlbinlog --verbose --base64-output=DECODE-ROWS your-mysql-binlog-filemame.000001

The above adds the interpretation of the RBR entires in the form of (unconventional) statements, commented, and strips out the cryptic RBR text. All that is left is to do a little manipulation on entry headers and uncomment the interpreted queries.

The script can be found in my gist repositories. Current version is as follows: Continue Reading »

Orchestrator 1.2.9 GA released

December 18, 2014

Orchestrator 1.2.9 GA has been released. Noteworthy:

  • Added "ReadOnly" (true/false) configuration param. You can have orchestrator completely read-only
  • Added "AuthenticationMethod": "multi": works like BasicAuth (your normal HTTP user+password) only it also accepts the special user called "readonly", which, surprise, can only view and not modify
  • Centralized/serialized most backend database writes (with hundreds/thousands monitored servers it was possible or probable that high concurrency led to too-many-connections openned on the backend database).
  • Fixed evil evil bug that would skip some checks if binary logs were not enabled
  • Better hostname resolve (now also asking MySQL server to resolve hostname; resolving is cached)
  • Pseudo-GTID (read here, here, here) support now considered stable (apart from being tested it has already been put to practice multiple times in production at Outbrain, in different planned and unplanned crash scenarios)

I continue developing orchestrator as free and open source at my new employer, Booking.com.

 

 

 
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