jarosan

# Run with: rake environment elasticsearch:reindex

namespace :elasticsearch do
  desc "re-index elasticsearch"
  task :reindex => :environment do

    klass = Place
    ENV['CLASS'] = klass.name
    ENV['INDEX'] = new_index = klass.tire.index.name << '_' << Time.now.strftime('%Y%m%d%H%M%S')

stevendanna

# psearch.rb: A knife plugin for the Partial Search API
#
# Note that this is a Beta feature of Opscode Hosted Chef
# and that it's interface may changed based on user feedback.
#
# This plugin is net yet officially supported by Opscode

class Psearch < Chef::Knife
  banner "knife psearch INDEX SEARCH NAME=DESIRED_KEY_PATH,[NAME=DESIRED_KEY_PATH]"

igstan

import java.util.List;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import org.codehaus.jackson.map.Module;
import org.junit.After;
import org.junit.Before;

import com.google.common.collect.Lists;

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

joshrobb

var async = require('async')

var git = require('util/git')
var misc = require('util/misc')

exports.get_deployedRevision = function(args, callback) {
  git.revParse(this.config.program_creator_dir, 'HEAD', function(err, stdout) {
    callback(null, stdout.replace(/^\s+|\s+$/g, ''))
  })
}

qrush

# somewhere in your middleware stack...
# request.env['yourapp.someid'] = "1337"

YourApp::Application.configure do
  config.log_tags = [
    -> request {
      request.env['yourapp.someid']
    }
  ]
end

ryandotsmith

Process Partitioning

The Problem

When working with large, high volume, low latency systems, it is often the case that processing data sequentially becomes detrimental to the system's health. If we only allow 1 process to work on our data we run into several challenges:

• Our process may fall behind resulting in a situation which it is impossible for our process to catch up.
• Our singleton process could crash and leave our system in a degraded state.
• The average latency of data processing could be dramatically affected by outlying cases.

RJ

#!/bin/bash
# Install fake erlang packages, then the ESL package
# Afterwards, installing packages that depend on erlang, like rabbitmq,
# will use the ESL packaged erlang without installing the older disto ones
#
apt-get install equivs
# Create fake erlang packages, since we are using esl-erlang instead
cd /tmp
apt-get install -y equivs

bokmann

# MOTIVATION:  As rails apps are growing, people are noticing the drawbacks
# of the ActiveRecord pattern.  Several apps I have seen, and several
# developers I have spoken to are looking towards other patterns for object
# persistence.  The major drawback with ActiveRecord is that the notion
# of the domain object is conflated with what it means to store/retrieve
# it in any given format (like sql, json, key/value, etc).
#
# This is an attempt to codify the Repository pattern in a way that would
# feel comfortable to beginner and seasoned Ruby developers alike.
#

douglasjarquin

rds-modify-db-parameter-group {param-group-name} \
--parameters="name=character_set_server, value=utf8, method=pending-reboot" \
--parameters="name=collation_server, value=utf8_general_ci, method=pending-reboot" \
--parameters="name=tmp_table_size, value={DBInstanceClassMemory/16}, method=pending-reboot" \
--parameters="name=max_heap_table_size, value={DBInstanceClassMemory/16}, method=pending-reboot" \
--parameters="name=query_cache_type, value=1, method=pending-reboot" \
--parameters="name=query_cache_size, value=131072, method=pending-reboot" \
--parameters="name=table_open_cache, value=2500, method=pending-reboot" \
--parameters="name=join_buffer_size, value={DBInstanceClassMemory/64}, method=pending-reboot" \
--parameters="name=thread_cache_size, value={DBInstanceClassMemory/12582880}, method=pending-reboot" \