HBase : Filters

All filters are implemented on the server side.
This is called predicate push down.

You can define a new instance of the filter by using
setfilter(filter)

a)Comparison Filters

Row Filter:
Gives the ability to filter data based on rowkeys.

Family Filter:
Used to filter column Families. Data is retrieved in a column family level.

Qualifier Filter:
Used to filter out specific column qualifier.

Value Filter:
Used to filter out columns with a specific value.

Dependent Column Filter:
It uses timestamp as the reference column and includes all other columns. It lets you specify a dependent column.

b)Dedicated Filters

SingleColumnValueFilter:
This filter is used when you have exactly one column that decides if an entire row should be returned or not.

SingleColumnValueExclude Filter:
This is an exclude filter. You will not get the column as a part of your result.

Prefix Filter:
All rows that match this prefix are returned the client.

Page Filter:
You specify the pagesize for your filter. This controls how many rows per page should be returned.

.....
More Later..

Putty : Network Error Permission Denied

Well after googling for more than 3 hours i figured out why i was not able to SSH to my VM.

Error: Network Error : Permission Denied.

Solution : Open Putty from any drive other than C:\ (DONT INSTALL PUTTY IN C:)

I copied Putty to my D:\\ . I was able to SSH to my VM.

(My Session on Putty)

Simple R Scatter Plo

x=c(13,16,14,11,17,9,13,17,18,12)
y=c(6.2,8.6,7.2,4.5,9.0,3.5,6.5,9.3,9.5,5.7)
length(x)
length(y)
plot(y~x,pch=19,col="blue",xlab="X axis",ylab="y axis",main="Scatter Plot Diagram")

Data Science

My technical Goals:

a) Learn Stats

b) Figure Out R

c) Learn Python

d) Figure out HBase / Hadoop

e) Learn the art of Visualization

   

I am sure with a bit of luck and effort i will get there.

Now In Focus : R Statistics

Expect more posts on Math :P

GitHub 2

I recently help some friends learn Git!!... here is the code to do stuff on GitHub...

// Installing Git on Ubuntu

sudo apt-get install git-core

//Git version

Git –version

//Add Colors to console

git config --global color.ui auto

// Status of Repo

git status

//Structure of Git

Tree .git

//See branches

Git branch -a

//See the origins

Git remote –v

//See the log

Git log

//See the recent changes

Git whatchanged

//Deleting Remote Origin

git remote rm origin

1^st Creating Identity

//Global User Name

git config --global user.name "Example Surname"

//Global Email

git config --global user.email "your.email@gmail.com"

2^nd Creating A Repo

//Initialize Git

Git init

//Make Changes to repo

//Stage your Changes

Git add README

//Commit the Staging area

Git commit –m ‘my first commit’

//Creating a URL linking to your repo

git remote add origin https://github.com/krishnakalyan3/Nousinfo

//Pushing your commit

git push origin master

//Make changes in repo

//To see the difference between the master and local

git fetch origin

git diff master origin/master

(git merge origin/master)

//Pulling from Origin

git pull origin master

3^rd Forking

//Fork 1^st + Copy the address and use the url to clone

Git clone 

//Create a branch

Git branch

//Checkout to the branch

Git checkout

//Create changes to that branch

Gedit …..

//Maybe do a status

//ADD and Commit

//Push it to the

Git push –u origin

//Check it out to update the file system

Git checkout master

GitHub

Lately i have been experimenting with Git. Its a  whole new way to code. I was really impressed with their philosophy Social Coding. That means more sharing :).
My new git hub repo.
https://gist.github.com/krishnakalyan3

If you want to learn Git follow the links below.
http://www.youtube.com/user/GitHubGuides
http://www.codeschool.com/courses/try-git

Installing Julia in CentOS

Julia

Programming language

Julia is a high-level dynamic programming language designed to address the requirements of high-performance numerical and scientific computing while also being effective for general purpose programming. Wikipedia

I am getting my hands dirty installing JULIA. After spending more than 4 hours, I have finally installed JULIA on my CentOS 32 bit OS.

The steps are as follows:

1) Install Github

2) Installing Dependencies

3) Install JULIA

5) Build JULIA using the make command.

Basic Steps:

yum install git

git clone git://github.com/JuliaLang/julia.git

Cd Julia/

Make –C deps getall

Su root

Yum install gcc-gfortran

yum -y install java-1.6.0-openjdk.x86_64 libXp openmotif openmotif22 python.x86_64 numpy* ncurses-devel gcc gcc-c++ autoconf automake

yum -y groupinstall "Development Tools"

make

./julia

Food Anyone

Well i admit it i splurge once a while. After splurging i keep promising myself i wont do it again. Some perks of living alone are that you you can eat what ever hell you like. Unlike most of the people i dislike a lot of things. (HATE is a strong word!! I wont use it :p).
a) CURD
b) MILK
c) KAREALA
d) BUTTER
f) ONIONS
g) SPICY STUFF
h) OILY STUFF
my list goes on......
I recently went to BBQ NATION. There was more than 40 kinds of things to eat. All i did was nibble here and nibble there. Horrible experience. Most of the stuff was either one of the things listed above or NON - VEG.

All told i regret paying them 800 Rs. ....

Word Count In Pig

Figuring out Github. Will post the code there once its done. :)

A = LOAD 'Nameipfile' using TextLoader();
B = FOREACH  A GENERATE FLATTEN(TOKENIZE($0)) as word;
C= FOREACH ( GROUP B by word ) GENERATE, GROUP  as word, COUNT($1) as ct;
Dump C;

WordCloud with Tag @Srisrispeaks

I have created a Twitter Word Cloud with all tweets having the tag @srisrispeaks.

Hortonworks Certified Apache Hadoop Developer (HCAHD)

What a feeling i cleared Hortonworks Certified Apache Hadoop Developer (HCAHD).
Preparation Tips:
Buy the Definitive Guide
Read it!
Make sure you have sufficient hands on and take the practice exam on the website.
There were some very good questions asked make sure you have your fundas clear.
With luck i am sure you will ace it!