nalin nalingarg2

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.

Ambari uses a local postgres db by default.This page describes how to use ambari-server with remote postgres server.

Install

Ambari is installed on centos 6.4 with the following command:

curl -so /etc/yum.repos.d/ambari.repo http://public-repo-1.hortonworks.com/ambari/centos6/1.x/GA/ambari.repo
yum repolist
yum -y install ambari-server

	Smoke Test
	curl -X GET -u "admin:admin" -i http://cm-host:7180/api/v9/tools/echo?message=hello

	Cluster Creation
	curl -X POST -u "admin:admin" -i \
	-H "content-type:application/json" \
	-d '{ "items": [
	{
	"name": "test",
	"version": "CDH4"

	<project>
	<repositories>
	<repository>
	<id>cdh.repo</id>
	<url>https://repository.cloudera.com/content/groups/cloudera-repos</url>
	<name>Cloudera Repository</name>
	</repository>
	…
	</repositories>
	<dependencies>

	useradd -m build
	passwd build

	yum list rpm*

	yum install -y rpmdevtools rpm-build

	exit

	rpmdev-setuptree

	yum install -y make
	yum install gcc gcc-c++ kernel-devel

	wget http://www.datsi.fi.upm.es/~frosal/sources/shc-3.8.7.tgz OR wget http://www.datsi.fi.upm.es/~frosal/sources/shc-3.8.9.tgz
	tar xvfz shc-3.8.7.tgz
	cd shc-3.8.7
	make

	#Test
	./shc -v

	sudo yum install mysql-server
	sudo service mysqld start
	sudo yum install mysql-connector-java


	Configuring MySQL

	Configure MySQL to use a strong password and to start at boot.

	Set the MySQL root password. Note that in the following procedure, your current root password is blank. Press the Enter key when you're prompted for the root password.

	#!/bin/bash
	set -x
	#IFS=":"
	LIST="118 117 116 112 103 44"
	for i in $LIST; do
	ssh [email protected].$i '
	passwd
	mkdir -p ~/.ssh/authorized_keys
	ssh-keygen -t rsa -P "" -f ~/.ssh/id_rsa
	chkconfig iptables off

	<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>org.nalin.hbase</groupId>
	<artifactId>hbasetest</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>hbasetest</name>