oodavid

Restore MySQL from Amazon S3

This is a hands-on way to pull down a set of MySQL dumps from Amazon S3 and restore your database with it

Sister Document - Backup MySQL to Amazon S3 - read that first

1 - Set your MySQL password and S3 bucket, make a temp dir, get a list of snapshots

# Set our variables

export mysqlpass="ROOTPASSWORD"

ndarville

Business Models

Advertising

Models	Examples
Display ads	Yahoo!
Search ads	Google

DonDebonair

import java.math.BigInteger;

public final class IbanTest {

    public static final int IBANNUMBER_MIN_SIZE = 15;
    public static final int IBANNUMBER_MAX_SIZE = 34;
    public static final BigInteger IBANNUMBER_MAGIC_NUMBER = new BigInteger("97");

    public static boolean ibanTest(String accountNumber) {
        String newAccountNumber = accountNumber.trim();

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.

---

jjfiv

// BSD License (http://lemurproject.org/galago-license)
package org.lemurproject.galago.utility.json;

public class JSONUtil {
  public static String escape(String input) {
    StringBuilder output = new StringBuilder();

    for(int i=0; i<input.length(); i++) {
      char ch = input.charAt(i);
      int chx = (int) ch;

joewiz

On Tue Oct 27, 2015, history.state.gov began buckling under load, intermittently issuing 500 errors. Nginx's error log was sprinkled with the following errors:

2015/10/27 21:48:36 [crit] 2475#0: accept4() failed (24: Too many open files)

2015/10/27 21:48:36 [alert] 2475#0: *7163915 socket() failed (24: Too many open files) while connecting to upstream...

An article at http://www.cyberciti.biz/faq/linux-unix-nginx-too-many-open-files/ provided directions that mostly worked. Below are the steps we followed. The steps that diverged from the article's directions are marked with an *.

1. * Instead of using su to run ulimit on the nginx account, use ps aux | grep nginx to locate nginx's process IDs. Then query each process's file handle limits using cat /proc/pid/limits (where pid is the process id retrieved from ps). (Note: sudo may be necessary on your system for the cat command here, depending on your system.)
2. Added fs.file-max = 70000 to /etc/sysctl.conf

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

serac

/*
 * See LICENSE for licensing and NOTICE for copyright.
 */
package edu.vt.middleware.app;

import java.io.File;
import java.security.*;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Predicate;