An advanced key value store – Advantages

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An advanced key value store – Advantages

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redistalk

Talk given to Rosslug 19-May-2014

On Github tommybobbins / redistalk

An advanced key value store

Talk by Tim Gibbon / @TommyBobbins

Advantages

  • Fast and lightweight - Raspberry Pi will handle 2000 requests per second.
  • Simple - easy set/get calls.
  • Can store all programatical data types ( arrays, hashes, strings, lists, sorted lists).
  • Large range of useful extras.
  • Can be easily clustered.
  • Persistence - data is written to disk.
Oh hey, these are some notes. They'll be hidden in your presentation, but you can see them if you open the speaker notes window (hit 's' on your keyboard).

Disadvantages

  • Security. Cannot be safely run across t'internet.
  • Number of available commands and configuration can be offputting.
  • Code is built by Pivotal, but is BSD licenced.

Using Redis?

  • Twitter
  • Github
  • Weibo
  • Pinterest
  • Snapchat
  • Craigslist
  • Digg
  • StackOverflow
  • Flickr
  • Me

Installing

                                               pi@raspberrypi: ~/$ sudo apt-get install redis-server python-redis

Command line usage

pi@raspberrypi ~/$ redis-cli -h localhost set temperature/sensor/cellar 20.0
OK
pi@raspberrypi ~/$ redis-cli -h localhost get temperature/sensor/cellar
"20.0"
pi@raspberrypi ~/$ redis-cli -h localhost expire temperature/sensor/cellar 5
(integer) 1
pi@raspberrypi ~/$ redis-cli -h localhost get temperature/sensor/cellar
"20.0"
pi@raspberrypi ~/$ redis-cli -h localhost get temperature/sensor/cellar
(nil)

Python and Redis

import redis
redthis = redis.StrictRedis(host='433board',port=6379, db=0, socket_timeout=3)

try:
    #Read in all the previous settings
    weather_temp=float(redthis.get("temperature/weather"))
    boiler_state=redthis.get("boiler/req")
    time_to_live=int(redthis.ttl("boiler/req"))
    redthis.set("temperature/calendar", calendar_temp)

Benchmarking

          pi@raspberrypi ~/$ redis-benchmark -q -n 1000
          PING_INLINE: 2659.57 requests per second
          PING_BULK: 2403.85 requests per second
          SET: 2242.15 requests per second 
          GET: 2352.94 requests per second
          INCR: 2242.15 requests per second
          LPUSH: 1855.29 requests per second
          LPOP: 2314.81 requests per second
          SADD: 2272.73 requests per second
          SPOP: 2577.32 requests per second
          LPUSH (needed to benchmark LRANGE): 2127.66 requests per second
          LRANGE_100 (first 100 elements): 964.32 requests per second
          LRANGE_300 (first 300 elements): 417.01 requests per second
          LRANGE_500 (first 450 elements): 250.13 requests per second
          LRANGE_600 (first 600 elements): 220.56 requests per second
          MSET (10 keys): 1488.10 requests per second

Application - Raspberry Pi powered home automation

THE END

Tim Gibbon / lunarlite.co.uk

github.com/tommybobbins/PiThermostat/

Photo Credits

  • Soho © ed_needs_a_bicycle CC BY-NC-SA 2.0
  • Old Tools and Spanners © Ian Britton CC BY-NC 2.0