ameenkhan07

What to Expect and Tips

• 45-minute systems interview, focus on responding to real world problems with an unhealthy service, such as a web server or database. The interview will start off at a high level troubleshooting a likely scenario, dig deeper to find the cause and some possible solutions for it. The goal is to probe your knowledge of systems at scale and under load, so keep in mind the challenges of the Facebook environment.
• Focus on things such as tooling, memory management and unix process lifecycle.

Systems

More specifically, linux troubleshooting and debugging. Understanding things like memory, io, cpu, shell, memory etc. would be pretty helpful. Knowing how to actually write a unix shell would also be a good idea. What tools might you use to debug something? On another note, this interview will likely push your boundaries of what you know (and how to implement it).

Design/Architecture 

Interview is all about taking an ambiguous question of how you might build a system and letting

yurishkuro

• What do Etcd, Consul, and Zookeeper do?
  • Service Registration:
    • Host, port number, and sometimes authentication credentials, protocols, versions numbers, and/or environment details.
  • Service Discovery:
    • Ability for client application to query the central registry to learn of service location.
  • Consistent and durable general-purpose K/V store across distributed system.
    • Some solutions support this better than others.
    • Based on Paxos or some derivative (i.e. Raft) algorithm to quickly converge to a consistent state.
• Centralized locking can be based on this K/V store.

boneskull

How to Use Mercurial Bookmarks

Note: This document is specific to the FocusVision development environment, however it's mostly applicable elsewhere.

by Christopher Hiller

Mercurial branches are not "cheap". Unlike Git, to create or destroy a branch, you actually have to commit a changeset to the repository. Branches are great for…something…but whatever that is, we're not doing it.

Enter Bookmarks.

rspeer

"""
This file contains code that, when run on Python 2.7.5 or earlier, creates
a string that should not exist: u'\Udeadbeef'. That's a single "character"
that's illegal in Python because it's outside the valid Unicode range.

It then uses it to crash various things in the Python standard library and
corrupt a database.

On Python 3... well, this file is full of syntax errors on Python 3. But
if you were to change the print statements and byte literals and stuff:

p01

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 Mathieu 'p01' Henri - http://www.p01.org/releases/

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

andyedinborough

(function (window, document, $, undefined) {
    if (!$.Deferred) throw 'jQuery 1.5 is required to use the jQuery.oauth script!';

    function require(name, url) {
        if (window[name] === undefined)
            return $.ajax({ type: 'GET', cache: true, dataType: 'script', url: url });
    }

    $.oauth = function (options) {
        var d = $.Deferred();

gvx

from itertools import product

def score(self, other):
	first = len([speg for speg, opeg in zip(self, other) if speg == opeg])
	return first, sum([min(self.count(j), other.count(j)) for j in 'ABCDEF']) - first

possible = [''.join(p) for p in product('ABCDEF', repeat=4)]
results = [(right, wrong) for right in range(5) for wrong in range(5 - right) if not (right == 3 and wrong == 1)]

def solve(scorefun):

zhengjia

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')