Microsoft's recent 10-K reveals that the software giant still views open source as more foe than friend.

Today, we are announcing that we're ready to offer training for InnoDB and XtraDB in Santa Clara and San Francisco.  The course was developed by Morgan Tocker with input from all our team - and covers a lot of the performance problems we run through in our consulting practice.

The Details:

14th Sept - Santa Clara
1 day intensive course
Cost: $300*

16th Sept - San Francisco
1 day intensive course
Cost: $300*

(* includes a copy of High Performance MySQL if you register before 31st Aug).

The delivery format:

Being only one day, we elected to deliver the course in a predominately lecture-format - but there will be a few opportunities to try examples.  For more information see the …

I got time to spend on a really old worklog I completed coding
already october 2005. I blogged about it in July 2006 and
interestingly enough it's still the second most read blog
entry on my blog (probably related to search engines in some
way).

I have merged it with the azalea tree (this is an internal code
name for our development tree, name is likely to change). This
tree contains subquery optimisations, Batched join and some more
optimisations.

I have fixed a whole bunch of bugs that always shows up in early
code. The code quality is still alpha but at least you won't find
10 bugs per hour :)


Here you can find the launch pad tree for this code.

There are two important additions made possible by this tree. …

Jonas just wrote a patch to this bug on OPTIMIZE TABLE, and the issue that was also discussed in this blog post. Jonas also fixed this bug when he was at it.

Before, OPTIMIZE TABLE hardly freed up any pages and to defragment you had to do a rolling restart of the data nodes.

Now, there is only a 2% discrepancy between OPTIMIZE TABLE and doing a rolling restart. This is great stuff.
This will fix will make it into 6.3.26 and 7.0.7.

See below for details:

Creating two tables, t5 and t6:

CREATE TABLE `t5` (
`id` varchar(32) CHARACTER SET utf8 NOT NULL,
`name` varchar(32) …

Currently a number of users has reported upgrade issues on 6.3.x to 7.0.6 (below is an example what might happen to you).

Thus, we don't recommend you to upgrade from 6.3.x to 7.0.6 in a production system yet.
However, we are very interested in bug reports and and help with testing.
We are also of course working on fixing these issues and will keep you posted when things has improved. Sorry for the inconvenience.

Currently the "best practice" to upgrade is to:
1) backup / mysqldump
2) start cluster 7.0.6 with initial so it is completely blank
3) restore backup / load dump


ERROR 1005 (HY000): Can't create table 'test.#sql-3d25_aa905' (Errno: 140)

mysql> show warnings;
+-------+------+--------------------------------------------------------------------------+
| Level | Code | Message |
…

1. NASA Nebula Services/Platform Stack -- The NEBULA platform offers a turnkey Software-as-a-Service experience that can rapidly address the requirements of a large number of projects. However, each component of the NEBULA platform is also available individually; thus, NEBULA can also serve in Platform-as-a-Service or Infrastructure-as-a-Service capacities. Bundles RabbitMQ, Eucalyptus, LUSTRE storage, Fabric deployment, Varnish front-end, MySQL and more. (via Jim Stogdill)
2. …

There has been a lot of talk lately about the “Open Source Cloud.” What will it look like, who will be behind it, and can I use it now? These were hot topics at OSCON, and Stephen O’Grady had two excellent posts on them recently as well (one, two). As many other folks do, I see a few major drivers of this: the need for private clouds, the prevention of vendor lock-in (proprietary services), and open source hackers just wanting to be able to extend and fix the source code. Some layers of this open source cloud stack are further along than others, and I’m going to attempt to outline what I’ve found so far along with what I think is missing.

Virtual Machine …

1. It’s easy to screw up thread safety.
   If you’re trying to format something for output (e.g. leading zeros, only 1 decimal place or whatever… you know, format specifiers in printf) you are setting a property on the stream, not on what you’re converting. So if you have a thread running that sets a format, adds something to the stream, and then unsets the format, you cannot have another thread able to come in and do something to that stream. Look out for thread unsafe cout code.
2. You cannot use streams for any text that may need to be translated.
   gettext is what everybody uses. You cannot get a page into the manual before it tells you that translators may want to change the order of what you’re printing. This goes directly against stringstream.
3. You need …

After the previous post in this caching related series I’ve received many questions on hardware and software configuration of our servers so in this post I’ll describe our server’s configs and the motivation behind those configs.

Hardware Configuration

Since in our setup Squid server uses one-process model (with an asynchronous requests processing) there was no point in ordering multi-core CPUs for our boxes and since we have a lots of pages on the site and the cache is pretty huge all the servers ended up being highly I/O bound. Considering these facts we’ve decided to use the following hardware specs for the servers:

CPU: One pretty cheap dual-core Intel Xeon 5148 (no need in multiple cores or really high frequencies – even these CPUs have ~1% avg load)
RAM: 8Gb (basically …

If you do not follow MariaDB development, I want to head up XtraDB has been commited to MariaDB server and will be included in binary releases of MariaDB (scheduled on end of August - September) as replacement of InnoDB storage engine. MariaDB will also include PBXT storage engine, Sphinx storage engine and few our non-InnoDB related patches (extended stats into slow-log)

Entry posted by Vadim | One comment

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