wesley tanaka

Tech

Shared variables in Gradle's buildscript block

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Gradle documentation on the internet has numerous examples of global variables that are defined at the top level of the file like this:

androidPluginVersion = '0.8.+'
buildscript {
  repositories {
    mavenCentral()
  }
  dependencies {
    classpath "com.android.tools.build:gradle:$androidPluginVersion"
  }
}

adb force install

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If you get Failure [INSTALL_FAILED_ALREADY_EXISTS] or Failure [INSTALL_FAILED_VERSION_DOWNGRADE] when installing an .apk on your Android emulator, you can run:

adb install -r -d path/to/the-debug-unaligned.apk

to force downgrading and replacing of the existing .apk package.

Elasticsearch Concepts

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The Elasticsearch guide has a useful map from relational database terminology to Elasticsearch terminology:

Vagrant setup for Drupal on Ubuntu

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Vagrant lets you run a single command, vagrant up which will download an operating system image, install it into Virtualbox, boot a virtual machine, and then run shell scripts or Puppet to install software packages or make other changes to the operating system after it boots up the first time.

Most compact way to store UUIDs in sqlite

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If you want to store a UUID in sqlite and use the minimal possible amount of disk space, it seems like the best solution may be to represent each UUID as a 16 byte binary string and store it in a BLOB column.  I tested inserting 100,000 UUIDs into a table using three strategies with Sqlite 3.7.9, and the resulting file sizes were:

Version in which .vagrant changed from a file to a directory

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Vagrant converted the .vagrant file into a directory in version 1.1.  There's code in Vagrant that will automatically convert your .vagrant file into a .vagrant directory: https://github.com/mitchellh/vagrant/commit/4e649cc98792c192c1589a0bd86e8433e90f60cd

Making directory trees equivalent to mkdir -p in puppet

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When you create a directory in Puppet using the file type, you may get this error if you haven't already created all parents of the directory in question first:

err: /Stage[main]//File[/path/to]/ensure: change from absent to directory failed: Cannot create /path/to; parent directory /path does not exist

This puppet module defines a custom function all_parents() which you can use to create a directory and all of its ancestors simultaneously.

Install ruby gems without root access in your home directory

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You can install a ruby gem in your home directory with:

gem install --user-install puppet-module 

or:

gem install --install-dir=$HOME/.gem/ruby/1.8 puppet-module

If you're using bundler:

bundle install --path $HOME/.gem

And then you can run the command line programs installed by adding the local bin directory to your path:

PATH="$HOME"/.gem/ruby/1.8/bin:"$PATH"
export PATH

Using celery with SQS

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Some notes about using celery with SQS:

  • acks_late does not seem to work
  • sending a task that's larger than the SQS message size limit fails with <?xml version="1.0"?><Error><Type>Sender</Type><Code>InvalidParameterValue</Code><Message>Value for parameter MessageBody is invalid. Reason: Message body must be shorter than 262144 bytes.</Message><Detail/></Error>

MessagePack vs JSON vs BSON

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Here is a benchmark of MessagePack vs JSON vs BSON in Python 2.7.3 in Ubuntu 12.04.4 LTS on a 2.5 GHz Intel Core2 Quad Q8300. The software used was:

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by Wesley Tanaka