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ArangoDB 1.4.11 Release: Enhancements & Bug Fixes
We have released a bug-fix release for ArangoDB 1.4. As it is carnival, we skipped 1.4.10 and moved directly to 1.4.11. Please note that we are also preparing the ArangoDB 2.0 release. Therefore it is important to use the
zypper install arangodb=1.4.11
(or whatever package manager you use) with an explicit version.
v1.4.11 (2014-02-27)
--------------------
* added SHORTEST_PATH AQL function
this calculates the shortest paths between two vertices, using the Dijkstra
algorithm, employing a min-heap
By default, ArangoDB does not know the distance between any two vertices and
will use a default distance of 1. A custom distance function can be registered
as an AQL user function to make the distance calculation use any document
attributes or custom logic:
RETURN SHORTEST_PATH(cities, motorways, "cities/CGN", "cities/MUC", "outbound", {
paths: true,
distance: "myfunctions::citydistance"
})
// using the following custom distance function
var aqlfunctions = require("org/arangodb/aql/functions");
aqlfunctions.register("myfunctions::distance", function (config, vertex1, vertex2, edge) {
return Math.sqrt(Math.pow(vertex1.x - vertex2.x) + Math.pow(vertex1.y - vertex2.y));
}, false);
* fixed bug in Graph.pathTo function
* fixed small memleak in AQL optimiser
* fixed access to potentially uninitialised variable when collection had a cap constraint
v1.4.10 (2014-02-21)
--------------------
* fixed graph constructor to allow graph with some parameter to be used
* added node.js "events" and "stream"
* updated npm packages
* added loading of .json file
* Fixed http return code in graph api with waitForSync parameter.
* Fixed documentation in graph, simple and index api.
* removed 2 tests due to change in ruby library.
* issue #756: set access-control-expose-headers on CORS response
the following headers are now whitelisted by ArangoDB in CORS responses:
- etag
- content-encoding
- content-length
- location
- x-arango-errors
- x-arango-async-id
ArangoDB 1.4.9 Release: Enhancements & Bug Fixes
This version is deprecated. Download the new version of ArangoDB
A bug-fix release is available
v1.4.9 (2014-02-07) ——————- * return a document’s current etag in response header for HTTP HEAD requests on documents that return an HTTP 412 (precondition failed) error. This allows retrieving the document’s current revision easily. * added AQL function `SKIPLIST` to directly access skiplist indexes from AQL This is a shortcut method to use a skiplist index for retrieving specific documents in indexed order. The function capability is rather limited, but it may be used for several cases to speed up queries. The documents are returned in index order if only one condition is used. /* return all documents with mycollection.created > 12345678 */ FOR doc IN SKIPLIST(mycollection, { created: [[ ‘>’, 12345678 ]] }) RETURN doc /* return first document with mycollection.created > 12345678 */ FOR doc IN SKIPLIST(mycollection, { created: [[ ‘>’, 12345678 ]] }, 0, 1) RETURN doc /* return all documents with mycollection.created between 12345678 and 123456790 */ FOR doc IN SKIPLIST(mycollection, { created: [[ ‘>’, 12345678 ], [ ‘<=’, 123456790 ]] }) RETURN doc /* return all documents with mycollection.a equal 1 and .b equal 2 */ FOR doc IN SKIPLIST(mycollection, { a: [[ ‘==’, 1 ]], b: [[ ‘==’, 2 ]] }) RETURN doc The function requires a skiplist index with the exact same attributes to be present on the specified colelction. All attributes present in the skiplist index must be specified in the conditions specified for the `SKIPLIST` function. Attribute declaration order is important, too: attributes must be specified in the same order in the condition as they have been declared in the skiplist index. * added command-line option `–server.disable-authentication-unix-sockets` with this option, authentication can be disabled for all requests coming in via UNIX domain sockets, enabling clients located on the same host as the ArangoDB server to connect without authentication. Other connections (e.g. TCP/IP) are not affected by this option. The default value for this option is `false`. Note: this option is only supported on platforms that support Unix domain sockets. * fail if invalid `strategy`, `order` or `itemOrder` attribute values are passed to the AQL TRAVERSAL function. Omitting these attributes is not considered an error, but specifying an invalid value for any of these attributes will make an AQL query fail. * call global arangod instance destructor on shutdown * issue #755: TRAVERSAL does not use strategy, order and itemOrder options these options were not honored when configuring a traversal via the AQL TRAVERSAL function. Now, these options are used if specified. * allow vertex and edge filtering with user-defined functions in TRAVERSAL, TRAVERSAL_TREE and SHORTEST_PATH AQL functions: // using user-defined AQL functions for edge and vertex filtering RETURN TRAVERSAL(friends, friendrelations, “friends/john”, “outbound”, { followEdges: “myfunctions::checkedge”, filterVertices: “myfunctions::checkvertex” }) // using the following custom filter functions var aqlfunctions = require(“org/arangodb/aql/functions”); aqlfunctions.register(“myfunctions::checkedge”, function (config, vertex, edge, path) { return (edge.type !== ‘dislikes’); // don’t follow these edges }, false); aqlfunctions.register(“myfunctions::checkvertex”, function (config, vertex, path) { if (vertex.isDeleted || ! vertex.isActive) { return [ “prune”, “exclude” ]; // exclude these and don’t follow them } return [ ]; // include everything else }, false); * issue #748: add vertex filtering to AQL’s TRAVERSAL[_TREE]() functionCheerio with Node.js and CoffeeScript | ArangoDB Tutorial
Foxx’ main purpose is to create a beautiful API for your AngularJS, EmberJS or Backbone.js front-end. However, sometimes you want to do more. We, for example, needed to parse some HTML files. ArangoDB is capable of using some Node.js modules, but unfortunately Cheerio was not one of those. One problem was that we did not support loading of JSON data modules. So, this was a good excuse to rewrite the module loader in ArangoDB to make it even more Node.js-friendly.
With those improvements, that are currently available in ArangoDB’s devel branch. You can now also “require” a JSON data file. These files must have a filename ending with “.json”. If the filename ends with “.coffee” it is treated as coffee-script file and automatically compiled into JavaScript.
A Foxx app can now contain its own “node_modules” directory to include Node modules which it requires. This makes it much easier to deploy a Foxx app.
CAP, Google Spanner, & Survival: Eventual Consistency | ArangoDB
In Next gen NoSQL: The demise of eventual consistency a recent post on Gigaom FoundationDB founder Dave Rosenthal proclaims the demise of eventual consistency. He argues that Google Spanner “demonstrates the falsity of a trade-off between strong consistency and high availability”. In this article I show that Google Spanner does not disprove CAP, but rather chooses one of many possible compromises between total consistency and total availability. For organizations with a less potent infrastructure than Google other compromises might be more suitable, and therefore eventual consistency is still a very good idea, even for future generations of nosql databases.
ArangoDB at FOSDEM 2014: Insights & Presentations
FOSDEM is an absolutely open and free conference in Brussels, Belgium. The conference offers an impressive amount of developer rooms discussing a broad range of technical topics, including NoSQL and graphs.
After a funny and productive ArangoDB hackathon weekend Frank and I arrived at FOSDEM on Sunday noon. We were looking forward to the talks in the graph devroom, but unfortunately for us it was not possible to enter the room (it was overfull, indicating a great quality of talks).
At the next speakers change Frank and I managed to slip into the room and could enjoy two inspiring talks by Neo4J.
Afterwards it was my turn to present the graph visualization interface in ArangoDB in a still crowded room (slides).
After my presentation, we handed out all our ArangoDB t-shirts to our fans.
Michael handing out T-Shirts to the audience
All together it was a great experience and a really huge amount of people visiting the same conference which impressed me a lot.
Thanks for the team at the Graph Processing devroom for giving me the opportunity to speak and for organizing such a great devroom.
We will meet again next year.
so long,
Michael
ArangoDB 1.4.6: Enhancements & Bug Fixes Released
This version is deprecated. Download the new version of ArangoDB
A new release of ArangoDB is available for download.
- issue #736: AQL function to parse collection and key from document handle
- added fm.rescan() method for Foxx-Manager
- fixed issue #734: foxx cookie and route problem
- added method `fm.configJson` for arangosh
- include `startupPath` in result of API `/_api/foxx/config`
ArangoDB 1.4.5 Release: Enhancements & Bug Fixes
This version is deprecated. Download the new version of ArangoDB
A new release of ArangoDB is available for download
- fixed issue #726: Alternate Windows Install Method
- fixed issue #716: dpkg -P doesn’t remove everything
- fixed bugs in description of HTTP API `_api/index`
- fixed issue #732: Rest API GET revision number
- added missing documentation for several methods in HTTP API `/_api/edge/…`
- fixed typos in description of HTTP API `_api/document`
- defer evaluation of AQL subqueries and logical operators (lazy evaluation)
- Updated font in WebFrontend, it now contains a version that renders properly on windows
- generally allow function return values as call parameters to AQL functions
- fixed potential deadlock in global context method execution
- added override file “arangod.conf.local” (and co)
ArangoDB’s Web Interface Screencast | Explore Management Tools
With ArangoDB we ship a nice and useful web interface for administration.
However we have not yet told you in a video what you can do with this interface.
This screencast will give a comprehensive overview over the features offered in the interface.
ArangoDB Xmas Edition 1.4.4: Release Notes and Updates
This version is deprecated. Download the new version of ArangoDB
We have released the bug-fix version 1.4.4 of ArangoDB. While this version only contains minor fixes, we have switched to a new build system for Windows. We are now using Visual Studio 2013 and CMAKE to build ArangoDB under Windows. This also includes a new installer (Nullsoft Scriptable Install System). ArangoDB can now be installed as a service under Windows.
Unix The configuration is now called “arangod.conf” instead of “arangod-uid.conf” in order to avoid confusion.
Windows The default installation directory is “c:Program FilesArangoDB-1.x.y”. During the installation process you may change this. In the following description we will assume that ArangoDB has been installed in the location ROOTDIR. You have to be careful when choosing an installation directory. You need either write permission to this directoy or you need to modify the config file for the server process. In the latter case the database directory and the Foxx directory should must be writable by the user.
Installating for a single user Select a different directory during installation. For example “C:/Users//arangodb” or “C:/ArangoDB”. Installating for multiple users Keep the default directory. After the installation edit the file “ROOTDIR/etc/arangodb/arangod.conf”. Adjust the “directory” and “app-path” so that these paths point into your home directory.
[database] directory = @HOMEDRIVE@/@HOMEPATH@/arangodb/databases [javascript] app-path = @HOMEDRIVE@/@HOMEPATH@/arangodb/appsCreate the directories for each user that wants to use ArangoDB.
Installating as Service Keep the default directory. After the installation open a command line as administrator (search for “cmd” and right click “run as administrator”)
cmd> arangod –install-service INFO: adding service ‘ArangoDB – the multi-purpose database’ (internal ‘ArangoDB’) INFO: added service with command line ‘”C:Program Files (x86)ArangoDB 1.4.4binarangod.exe” –start-service’Open the service manager and start ArangoDB. In order to enable logging edit the file “/etc/arangodb/arangod.conf” and uncomment the file option.
[log] file = @ROOTDIR@/var/log/arangodb/arangod.logArangoDB at RubyConf 2013: Insights and Presentations
RubyConf is a yearly conference in the USA with people coming from all over the world to discuss about Ruby, Rails and related topics. Every year a different city hosts this conference – this year the conference took place in sunny Miami Beach. This year Dirk Breuer – the other main developer behind Guacamole – and I went there to learn from the speakers talking about a wide range of topics. Apart from the great talks there was a lot of opportunity to talk to Rubyists from entirely different areas like social networks or banking backend systems, the problems they face and the solutions they found for them. Of course there were a lot of people catching a sight of our ArangoDB shirts and coming towards us to ask about ArangoDB and the Ruby support. The question ranged from basic questions (“What is ArangoDB?”) to more involved questions about AQL for example. As always we were happy to answer all of them!
Main hall of RubyConf 2013
All videos from the conference are online now. The excellent keynote by Katie on the second day is not only interesting to Rubyists, but everyone enthusiastic about programming and especially teaching it. If you understand German and want to get more tips about which talks to watch, download episode 26 of Geekstammtisch where we discussed RubyConf.