Press minus + shift + s and return to chop/fold long lines!
RDBMS-based job queues have been criticized recently for being unable to handle heavy loads. And they deserve it, to some extent, because the queries used to safely lock a job have been pretty hairy. SELECT FOR UPDATE followed by an UPDATE works fine at first, but then you add more workers, and each is trying to SELECT FOR UPDATE the same row (and maybe throwing NOWAIT in there, then catching the errors and retrying), and things slow down.
On top of that, they have to actually update the row to mark it as locked, so the rest of your workers are sitting there waiting while one of them propagates its lock to disk (and the disks of however many servers you're replicating to). QueueClassic got some mileage out of the novel idea of randomly picking a row near the front of the queue to lock, but I can't still seem to get more than an an extra few hundred jobs per second out of it under heavy load.
So, many developers have started going straight t
| /** | |
| * An AngularJS directive for Dropzone.js, http://www.dropzonejs.com/ | |
| * | |
| * Usage: | |
| * | |
| * <div ng-app="app" ng-controller="SomeCtrl"> | |
| * <button dropzone="dropzoneConfig"> | |
| * Drag and drop files here or click to upload | |
| * </button> | |
| * </div> |
| A comparison of Collection+JSON, HAL, JSON-LD and SIREN media types. | |
| Discussion at | |
| http://sookocheff.com/posts/2014-03-11-on-choosing-a-hypermedia-format/ |
| Prerequisites | |
| sudo apt-get install openjdk-7-jdk | |
| Install | |
| cd ~ | |
| wget https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-1.1.0.deb | |
| sudo dpkg -i elasticsearch-1.1.0.deb |
When hosting our web applications, we often have one public IP
address (i.e., an IP address visible to the outside world)
using which we want to host multiple web apps. For example, one
may wants to host three different web apps respectively for
example1.com, example2.com, and example1.com/images on
the same machine using a single IP address.
How can we do that? Well, the good news is Internet browsers
| /** | |
| * Changes value to past tense. | |
| * Simple filter does not support irregular verbs such as eat-ate, fly-flew, etc. | |
| * http://jsfiddle.net/bryan_k/0xczme2r/ | |
| * | |
| * @param {String} value The value string. | |
| */ | |
| Vue.filter('past-tense', function(value) { | |
| // Slightly follows http://www.oxforddictionaries.com/us/words/verb-tenses-adding-ed-and-ing | |
| var vowels = ['a', 'e', 'i', 'o', 'u']; |
$ ssh remote-host "epmd -names"
epmd: up and running on port 4369 with data:
name some_node at port 58769
Note the running on port for epmd itself and the port of the node you're interested in debugging. Reconnect to the remote host with these ports forwarded:
$ ssh -L 4369:localhost:4369 -L 58769:localhost:58769 remote-host
| box: wercker-labs/docker | |
| build: | |
| steps: | |
| - script: | |
| name: fix timestamps | |
| code: | | |
| sudo wget https://gist.githubusercontent.com/davidwindell/fbfef588c6295666c6a1/raw/c2870b13a50a7aeb4aed1e6eb4daec3a905a7fc0/git-timestamp.sh -O /usr/local/bin/git-timestamp | |
| sudo chmod +x /usr/local/bin/git-timestamp | |
| git-timestamp composer.json | |
| git-timestamp composer.lock |
| .git |