MongoDB

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MongoDB & Node.js events in Stockholm, Aug 26

Monday, Aug 26 will be an exciting day if you live around Stockholm and are interested in MongoDB, Node.js or just open source and web programming or anything in this direction.

In the morning, from 9:00 to 12:00 I will be doing MongoDB office hours. This is an "ask the expert(s)" type of free community consulting thing we do regularly at 10gen. You can come and discuss your MongoDB application, architecture or just basic questions. First come, first served. Please RSVP at http://www.meetup.com/Stockholm-MongoDB-User-Group/events/134695732/

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Thoughts from Oscon: Why diversity is annoying and assholes run large corporations

Oscon is over, I'm home and recovered both from jet lag and just general exhaustion.

Oscon is a very broad conference so there is a lot to learn and many people and projects to befriend. There are many things and angles one could write a blog post about. To me Oscon is above all the conference to meet other open source people and have the deep and inspiring discussions. So in that spirit I will make a few philosophical remarks in this post, thoughts from Oscon 2013.

If you'd want to read a run-through of the conference itself, I recommend Dirk van den Poel's very extensive summary.

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pt-query-digest for MongoDB profiler logs

One of my favorite MySQL tools ever is pt-query-digest. It's the tool you use to generate a report of your slow query log (or some other supported sources), and is similar to for example the Query Analyzer in MySQL Enterprise Monitor. Especially in the kind of job I am, where I often just land out of nowhere on a server at the customer site, and need to quickly get an overview of what is going on, this tool is always the first one I run. I will show some examples below.

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Slides from Spatial functions in MySQL 5.6, MariaDB 5.5, PostGIS 2.0 and others at Percona Live

Slides from my Percona Live talk evaluating the new spatial features in MySQL 5.6 and MariaDB 5.5 are now online. This is new material I have never presented before. It is based on work I have done in my job at Nokia HERE.com location services. So even if at this conference it draws less attention than my HA talks, it is actually what I'm most proud of to present.

TL;DR summary is that PostgreSQL has lots of features but MySQL has much better ease of use and performance. (I copy paste this standard sentence into any PostgreSQL vs MySQL evaluation I do :-) The MongoDB info is basically outdated, as the new 2.4 release introduces completely new implementation based on GeoJSON, new indexing, neither of which I tested.

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HowTo deploy a sharded MongoDB Cluster with AWS CloudFormation

As I hinted yesterday I've tried to automate the deployment of a sharded MongoDB cluster in Amazon. It's unnecessarily difficult (rumor has it 10gen is doing something about it in the future) but it's doable with appropriate amount of persistence.

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One liner to find a shard in a MongoDB cluster

I occasionally post so called "one liners", shell commands that can be used to filter out some data I need. The main reason I do this is that I can later find this when I try to google for it. This will be my first one liner for MongoDB. Ok, so it is actually 3 related one liners.

If you need to find out if a shard is already part of your MongoDB cluster, try this:


MONGOS="ec2-54-228-106-184.eu-west-1.compute.amazonaws.com"
echo "db.shards.find()" | mongo $MONGOS/config | grep Shard4 | wc -l

The result will be either 1 or 0.

Now, if the shard exists, you might want to know a hostname and port number of one of the members of that replicaset:

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