As you surely recognized we´ve released ArangoDB 3.0 a few days ago. It comes with great cluster improvements like synchronous replication, automatic failover, easy up- and downscaling via the graphical user interface and with lots of other improvements. Furthermore, ArangoDB 3 is even better integrated with Apache Mesos and DC/OS.

The mission of ArangoDB is to simplify the complexity of data work. ArangoDB is a distributed native multi-model NoSQL database that supports JSON documents, graphs and key-value pairs in one database engine with one query language. The cluster management is based on Apache Mesos, a battle-hardened technology. With the launch of DC/OS by a community of more than 50 companies all ArangoDB users can easily scale.

Just a little while ago setup, management, and maintenance of a database cluster was just a world of pain. Everybody who has put effort into getting automatic failover to work or who..

Most of us saw the fantastic movie 300 (I did it last night…again) or at least read the comics. 300 spartans barely wearing anything but achieving a lot. This little how-to will show you how to put ArangoDB into Spartan-Mode and thereby reduce memory-footprint and CPU usage.

Big thanks to Conrad from L.A. for his time and for giving us the impulse for this little how-to!

Suppose there is an AQL query that’s executing in the server for a long time already and you want to get rid of it. What can be done to abort that query?

If a connection to the server can still be established, the easiest is to use the ArangoShell to fetch the list of currently executing AQL queries and send a kill command to the server for the correct query.

To start, we can fetch the list of all running queries and print their ids, query strings and runtimes. This is only inspection and does not abort any query:

var queries = require("org/arangodb/aql/queries"); queries.current();

Here’s..

When I work with ArangoDB on my Mac, I usually install ArangoDB via homebrew and do tests on the latest new developments based on the devel-branch, compiling ArangoDB right from source.

To test a feature in a special version I use docker images that need a virtual machine on MacOS. I struggled with Boot2Docker several times and recently tried Docker Machine – with the Web UI Kitematic – currently in beta.

The implementation of the JavaScript require function will be adjusted to improve compatibility with npm modules. The current implementation in 2.7 and earlier versions of ArangoDB strictly adheres to the CommonJS module standard, which deviates from the behaviour implemented in Node and browser bundlers.

Module paths will now be resolved in the following ways:

• relative paths (e.g. ./hello) will be resolved relative to the current file
• absolute paths (e.g. /hello) will be resolved relative to the file system root
• global names (e.g. hello) will be resolved by looking in the following places:

Motivation

In multi-threaded applications running on multi-core systems, it occurs often that there are certain data structures, which are frequently read but relatively seldom changed. An example of this would be a database server that has a list of databases that changes rarely, but needs to be consulted for every single query hitting the database. In such situations one needs to guarantee fast read access as well as protection against inconsistencies, use after free and memory leaks.

Therefore we seek a lock-free protection mechanism that scales to lots of threads on modern machines and..

In this article I want to explain how to setup a nonce-microservice using docker.

Nonce are one-time tokens that are used to ensure that an action can only be taken once. In a project, we needed to ensure that a pay button is only pressed once. Note that nonces are not used to sign requests or identify a user. This is a separate mechanism.

ArangoDB contains a nonce implementation which is a variation of Bloom-filters. It allows to store nearly unlimited nonces within a limited amount of memory. Nonce are allowed to age, that is after an hour they might expire. If there is sufficient interest,..

We want to have a full chain of trust for our debian packages. Therefore the Suse Open Build Service (OBS) service signs them. We publish the key alongside the repository.

However, one can do better and do the validation right on apt-get install arangodb. Here’s how:

I just came across a question about how to create highscore lists or leaderboards in ArangoDB, and how they would work when compared to Redis sorted sets.

This blog post tries to give an answer on the topic and also detailed instructions and queries for setting up highscore lists with ArangoDB. The additional section “Extensions” explains slightly more advanced highscore list use cases like multi-game highscore lists, joining data and maintaining a “last updated” date.

A highscore list in Redis

Highscore lists are normally used to quickly determine who’s currently at the top, so we obviously..