nathanaschbacher

<h1>Heading</h1>
<ul>
  <li>asterisk list 1</li>
  <li>asterisk list 2</li>
</ul>
<ul>
  <li>hyphen list 1</li>
  <li>hyphen list 2</li>
  <li>hyphen list 3</li>
</ul>

nathanaschbacher

##Driver

Customers often request “versioning” or “restore/undo” functionality, as a means of data recovery from user error (as opposed to recovery from hardware failure or data loss errors, at which Riak already excels). If an object is changed or deleted by the end user, but later needs to be restored, is there a way to either look at a transaction log to undo the damage, or to explicitly restore the object to a previous version?

##Overview

This solution provides one simple example of an implementation for a transaction/audit journal and restoring lost/deleted objects for a known key. A separate global transaction/audit journal could also be built to provide an index to get an object key in the case where you don't know it beforehand, but that use case is outside the scope of this document.

The algorithm used here depends only on Riak's key/value functionality for two reasons. First, to show that a solution to the problem can be simply and efficiently implemented with a key/value pattern. Second, relyin

nathanaschbacher

var inspect = require('util').inspect;
var Class1 = function Class1() {
    this.frank = "costanza";

    this.__defineGetter__('prop', function() {return 5;});
    this.__defineGetter__('fromClass1', function() {return 5;});
}

Class1.prototype.heyThere = function() {}

nathanaschbacher

var Foo = function Foo() {
    this.id = 1;
}

var Bar = function Bar(foo) {
    this.id = 2;
    this.buddies = {};
}

Bar.prototype.toJSON = function() {

nathanaschbacher

HTTP/1.1 200 OK
Date: Mon, 19 Jul 2004 16:18:20 GMT
Server: Apache
Last-Modified: Sat, 10 Jul 2004 17:29:19 GMT
ETag: "1d0325-2470-40f0276f"
Accept-Ranges: bytes
Content-Length: 9328
Connection: close
Content-Type: text/html

nathanaschbacher

var MyClass = function MyClass() {
    this.property = 'something';
}


var temp = new MyClass();
console.log(temp instanceof MyClass);  // prints 'true'


temp = JSON.parse(JSON.stringify(temp));

nathanaschbacher

var msgpack = require('msgpack-js');
var msgpack2 = require('msgpack2');
var os = require('os');

console.log(" OS: " + os.type() + " " + os.release() + " (" + os.arch() + ")");
console.log("RAM: " + os.totalmem()/1048576 + " MB (total), " + os.freemem()/1048576 + " MB (free)");
console.log("CPU: " + os.cpus()[0].speed + " MHz " + os.cpus()[0].model);

for(var r = 1; r < 4; r++) {
  console.log("\nRun #" + r + ":");

nathanaschbacher

override_attributes( 
  "riak" => {
    "control" => {
      "enabled" => true,
      "userlist" => { "default_user" => ["!merge:user", "!merge:pass", "Pablo", "Turbine2012"]} 
    }
  }
)

nathanaschbacher

var cookie_str = "__utmb=7853809.51.10.1337306437; uniquekey=133730899192d4bf232ce84c6";

var uniquekey = cookie_str.split('uniquekey=')[1];

console.log(uniquekey);

nathanaschbacher

module.exports = function(input, args) {
  var expensiveResults = // Do some computationally expensive stuff with input and args...
  
  this.emit('results', expensiveResults);
}