Senthil Kumar senthil245

## The Technical Interview Cheat Sheet.md

      
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                senthil245
                / The Technical Interview Cheat Sheet.md
            
            
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              July 23, 2019 06:39
                — forked from tsiege/The Technical Interview Cheat Sheet.md
            
              
                This is my technical interview cheat sheet. Feel free to fork it or do whatever you want with it. PLEASE let me know if there are any errors or if anything crucial is missing. I will add more links soon.
              
          
    Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics.  It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth.  It also will be available as a gist on Github for everyone to edit and add to.
Data Structure Basics

###Array
####Definition:

Stores data elements based on an sequential, most commonly 0 based, index.
Based on tuples from set theory.


## JDK 1.6 Installation in Ubuntu
Install Java JDK 6.0 update 31 on Ubuntu 12.04 LTS

Introduction
The first question is why are we installing an old JDK. The answer is that Oracle JDK 6.0 update 31 is the JDK recommended by Cloudera when installing CDH4 (Cloudera Distribution Hadoop v4).

This is an update to an older version of this post. Mainly I have changed the JDK from 1.6.0_26 to 1.6.0_31 as this is the recommended JDK for CDH4 .

Install Java
I have a 64 bit version of Ubuntu 12.04 LTS installed, so the instructions below only apply to this OS.

## accumulo_notes
Oct 17, 2012 - See https://github.com/medined/accumulo_stackscript for an even better script. Really ignore the stuff below. Go. Scoot.

Aug 28, 2012 - See http://affy.blogspot.com/2012/08/stackscript-for-accumulo-on-linode.html for a more concise method is configuring accumulo. I'll leave this gist unchanged for fans of history.

My goal was to get Accumulo running on a VirtualBox Ubuntu instance. I was successful using the following steps. If a line starts with $ then it is a command-line to execute. Note that you'll need to have sudo privilege. My username was 'ubuntu'. If you are using a different username, you'll need to change the process a little bit. I'll try to point out where.

https://issues.apache.org/jira/browse/ACCUMULO

##########
# Start a new VirtualBox instance using the Ubuntu 11.10

## CDH3 setup
##########
# For verification, you can display the OS release.
##########
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=11.10
DISTRIB_CODENAME=oneiric
DISTRIB_DESCRIPTION="Ubuntu 11.10"

##########

## CDH4 in pseudo mode Notes
# JDK 1.6 Installation. Refer this link for smooth installation.
# http://akbarahmed.com/2012/06/22/install-java-jdk-6-0-update-26-on-ubuntu-12-04-lts/

# Installing CDH4 on a Single Linux Node in Pseudo-distributed Mode
# https://ccp.cloudera.com/display/CDH4DOC/Installing+CDH4+on+a+Single+Linux+Node+in+Pseudo-distributed+Mode

# Installing CDH4 with MRv1 on a Single Linux Node in Pseudo-distributed mode
# On Ubuntu and other Debian systems
nipra@lambda:Downloads$ wget -cv http://archive.cloudera.com/cdh4/one-click-install/precise/amd64/cdh4-repository_1.0_all.deb
nipra@lambda:Downloads$ sudo dpkg -i cdh4-repository_1.0_all.deb # Adds /etc/apt/sources.list.d/cloudera-cdh4.list ??
	Install Java JDK 6.0 update 31 on Ubuntu 12.04 LTS

	Introduction
	The first question is why are we installing an old JDK. The answer is that Oracle JDK 6.0 update 31 is the JDK recommended by Cloudera when installing CDH4 (Cloudera Distribution Hadoop v4).

	This is an update to an older version of this post. Mainly I have changed the JDK from 1.6.0_26 to 1.6.0_31 as this is the recommended JDK for CDH4 .

	Install Java
	I have a 64 bit version of Ubuntu 12.04 LTS installed, so the instructions below only apply to this OS.
	Oct 17, 2012 - See https://github.com/medined/accumulo_stackscript for an even better script. Really ignore the stuff below. Go. Scoot.

	Aug 28, 2012 - See http://affy.blogspot.com/2012/08/stackscript-for-accumulo-on-linode.html for a more concise method is configuring accumulo. I'll leave this gist unchanged for fans of history.

	My goal was to get Accumulo running on a VirtualBox Ubuntu instance. I was successful using the following steps. If a line starts with $ then it is a command-line to execute. Note that you'll need to have sudo privilege. My username was 'ubuntu'. If you are using a different username, you'll need to change the process a little bit. I'll try to point out where.

	https://issues.apache.org/jira/browse/ACCUMULO

	##########
	# Start a new VirtualBox instance using the Ubuntu 11.10
	##########
	# For verification, you can display the OS release.
	##########
	$ cat /etc/lsb-release
	DISTRIB_ID=Ubuntu
	DISTRIB_RELEASE=11.10
	DISTRIB_CODENAME=oneiric
	DISTRIB_DESCRIPTION="Ubuntu 11.10"

	##########
	# JDK 1.6 Installation. Refer this link for smooth installation.
	# http://akbarahmed.com/2012/06/22/install-java-jdk-6-0-update-26-on-ubuntu-12-04-lts/

	# Installing CDH4 on a Single Linux Node in Pseudo-distributed Mode
	# https://ccp.cloudera.com/display/CDH4DOC/Installing+CDH4+on+a+Single+Linux+Node+in+Pseudo-distributed+Mode

	# Installing CDH4 with MRv1 on a Single Linux Node in Pseudo-distributed mode
	# On Ubuntu and other Debian systems
	nipra@lambda:Downloads$ wget -cv http://archive.cloudera.com/cdh4/one-click-install/precise/amd64/cdh4-repository_1.0_all.deb
	nipra@lambda:Downloads$ sudo dpkg -i cdh4-repository_1.0_all.deb # Adds /etc/apt/sources.list.d/cloudera-cdh4.list ??