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Check for Java Development Kit (JDK) version

$ java -version
java version "1.7.0_171"
OpenJDK Runtime Environment (rhel-2.6.13.0.el7_4-x86_64 u171-b01)
OpenJDK 64-Bit Server VM (build 24.171-b01, mixed mode)

For scala to be set up JDK 8 or greater version is required
if JDK/OpenJDK version is less than 1.8 then follow the below steps

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# Install R + RStudio on Ubuntu 14.04

sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-keys E084DAB9

# Ubuntu 12.04: precise
# Ubuntu 14.04: trusty
# Ubuntu 16.04: xenial
# Basic format of next line deb https://<my.favorite.cran.mirror>/bin/linux/ubuntu <enter your ubuntu version>/
sudo add-apt-repository 'deb https://ftp.ussg.iu.edu/CRAN/bin/linux/ubuntu trusty/'
sudo apt-get update

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Standalone Spark 2.0.0 with s3

###Tested with:

• Spark 2.0.0 pre-built for Hadoop 2.7
• Mac OS X 10.11
• Python 3.5.2

Goal

Use s3 within pyspark with minimal hassle.

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1)What is Difference between Secondary namenode, Checkpoint namenode & backupnod Secondary Namenode, a poorly named component of hadoop.

(2)What are the Side Data Distribution Techniques.

(3)What is shuffleing in mapreduce?

(4)What is partitioning?

(5)Can we change the file cached by Distributed Cache

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// Find the minimum path sum (from root to leaf)
public static int minPathSum(TreeNode root) {
	if(root == null) return 0;
	int sum = root.val;
	
	int leftSum = minPathSum(root.left);
	int rightSum = minPathSum(root.right);
	
	if(leftSum < rightSum){
		sum += leftSum;

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# MWS API docs at http://docs.developer.amazonservices.com/en_US/orders-2013-09-01/Orders_Datatypes.html#Order
# MWS Scratchpad at https://mws.amazonservices.com/scratchpad/index.html
# Boto docs at http://docs.pythonboto.org/en/latest/ref/mws.html?#module-boto.mws

from boto.mws.connection import MWSConnection

...

# Provide your credentials.
conn = MWSConnection(

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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?

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People

:bowtie:	😄 :smile:	😆 :laughing:
😊 :blush:	😃 :smiley:	☺️ :relaxed:
😏 :smirk:	😍 :heart_eyes:	😘 :kissing_heart:
😚 :kissing_closed_eyes:	😳 :flushed:	😌 :relieved:
😆 :satisfied:	😁 :grin:	😉 :wink:
😜 :stuck_out_tongue_winking_eye:	😝 :stuck_out_tongue_closed_eyes:	😀 :grinning:
😗 :kissing:	😙 :kissing_smiling_eyes:	😛 :stuck_out_tongue:

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Setup multiple git identities & git user informations

/!\ Be very carrefull in your setup : any misconfiguration make all the git config to fail silently ! Go trought this guide step by step and it should be fine 😉

Setup multiple git ssh identities for git

• Generate your SSH keys as per your git provider documentation.
• Add each public SSH keys to your git providers acounts.
• In your ~/.ssh/config, set each ssh key for each repository as in this exemple:

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import multiprocessing #:)

def do_this(number):
  print number
  return number*2

# Create a list to iterate over. 
# (Note: Multiprocessing only accepts one item at a time)
some_list = range(0,10)