sukharevd

#!/usr/bin/python
# -*- coding: utf-8 -*-
'''
AWS S3 Gzip compression utility

Author: Dmitriy Sukharev
Modified: 2013-09-11
-------

Synchronizes directory with gzipped content of Amazon S3 bucket with local

tsiege

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






\

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

ptaoussanis

(comment ; Fun with transducers, v2

  ;; Still haven't found a brief + approachable overview of Clojure 1.7's new
  ;; transducers in the particular way I would have preferred myself - so here goes:

  ;;;; Definitions
  ;; Looking at the `reduce` docstring, we can define a 'reducing-fn' as:
  (fn reducing-fn ([]) ([accumulation next-input])) -> new-accumulation
  ;; (The `[]` arity is actually optional; it's only used when calling
  ;; `reduce` w/o an init-accumulator).

wonjun27

Scalr

http://highscalability.com/blog/2010/3/22/7-secrets-to-successfully-scaling-with-scalr-on-amazon-by-se.html
http://stackoverflow.com/questions/10061843/how-to-convert-linux-cron-jobs-to-the-amazon-way

Cron Jobs Are Hard To Distribute

Watch out when scaling out instances with cron jobs on them. Cron jobs aren't designed for the cloud. If the machine image holding your cron job scales out to 20 instances, your cron job will be executed 20 times more often.

This is fine if the scope of your cron job is limited to the instance itself, but if the scope is larger, the above becomes a serious problem. And if you single out a machine to run those cron jobs, you run the risk of not having it executed if that machine goes down.

fritzy

SELECT json_build_object(
  'total', (SELECT n_live_tup FROM pg_stat_user_tables WHERE relname='sometable'),
  'count', count(sometable_rows.*),
  'offset', 0,
  'results', json_agg(row_to_json(sometable_rows))
)
FROM (SELECT * FROM sometable
ORDER BY "time"
LIMIT 10 OFFSET 0)
sometable_rows;

tomazzaman

Killing supervisor if any of it's child processes fail

The trick is to only register the listener for events that indicate failure, namely

• PROCESS_STATE_STOPPED
• PROCESS_STATE_EXITED
• PROCESS_STATE_FATAL

Once they do, we should send a SIGQUIT to Supervisor.

taxigy

layout	title	date	categories	crossposted
post	How I learned Clojure while solving easy coding challenges	2015-08-03	coding	logdown

I decided to learn Clojure (and therefore ClojureScript, since the two intersect significantly) by doing. Who'd ever blame me with that?