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Comparison: Lockless programming with atomics in C++ 11 vs. mutex and RW-locks
ArangoDB is multithreaded and able to use several CPU-cores at once. Because of that access to common data structures to these threads have to be protected from concurrent access. ArangoDB currently uses mutexes, spinlocks and RW-locks for that. With the ongoing development of the MVCC the number of situations where protected access is needed grows…
ArangoDB 2.4.3 Release: Bug Fixes and Enhancements
This version is deprecated. Download the new version of ArangoDB A maintenance release for ArangoDB 2.4 is available for download or via your favorite package manager. v2.4.3 (2015-02-06) fix multi-threading with openssl when running under Windows fix timeout on socket operations when running under Windows Fixed an error in Foxx routing which caused some apps…
ArangoDB Logstash Output: Efficient Data Integration
Inspired by a question on StackOverflow, I did some investigation about how to make Logstash send log events to ArangoDB. There is no dedicated Logstash output plugin for ArangoDB on the Logstash plugins page, so I had already accepted to write one on my own. Browsing the plugins page for inspiration, I found an HTTP…
Dynamic Attribute Names in AQL: ArangoDB Techniques
On our mailing list, there is quite often the question whether attribute names in objects returned from AQL queries can be made dynamic. Jan discusses in his blog how such dynamic attribute names could be expressed and shows the current implementation that comes with ArangoDB 2.5 – adapting an ES6 proposal that might bring robust…
ArangoDB Optimizer Rule: Efficient Calculations
In the upcoming ArangoDB 2.5 (current devel branch) a new optimizer rule move-calculations-down was added. Jan showcases in his latest blog post how queries with calculations could benefit from this new optimiser rule. Read in Jan’s blog how this rule could accelerate your queries
ArangoDB 2.4.2
This version is deprecated. Download the new version of ArangoDB A maintenance release for ArangoDB 2.4.2 is available for download or via your favourite package manager. v2.4.2 (2015-01-30) added custom visitor functionality for AQL traversals This allows more complex result processing in traversals triggered by AQL. A few examples are shown in this article. improved…
Harness the Power of Custom Visitors for AQL Graph Traversals
Jan blogged about some recent extensions for the AQL graph traversal functionality in ArangoDB. These extensions allow invoking user-defined JavaScript code for filtering and results generation in AQL queries that contain traversals. This should make AQL graph traversals much more powerful than before. Additionally, AQL graph traversals get more configurable, allowing to write traversal functions…
New Address for GitHub: ArangoDB Updates
We have moved our ArangoDB Github repository from triAGENS to arangodb. The database: triAGENS/ArangoDB –> arangodb/arangodb We’ve also moved: arangodb-php –> arangodb/arangodb-php elasticsearch-river-arangodb –> arangodb/elasticsearch-river-arangodb For a certain amount of time the old triAGENS – repositories will redirect to the new ones.
New Foxx Debugging Preview: ArangoDB Updates
We are working hard to improve usability and simplify the usage of Foxx which will be shipped with version 2.5. of ArangoDB. We have learned from the past and collected a lot of feedback, thanks to all people using Foxx already. It helped us to identify the following three important areas of Foxx that should…
Building a self-learning game with ArangoDB, io.js & AngularJS in half a day.
With the ArangoDB Foxx Microservice Framework we’ve introduced an easy way to create a Web API right on top of the NoSQL database. In early January Max challenged Andreas (AngularJS / NodeJS) that they could build a full-stack application within half a day. The web application – in short – is a guessing game, in…