Raspberry pi - prepare for Kernel Space Programming

Raspberry pi is one of the most popular SBC in market with ARM processor. It is very popular among students for playing as embedded stuff.

There are few points, need to noted down, while working or playing with Raspberry pi.

1. SDCard shows 56 MB, while I've 4 / 8 / 16 GB etc.

The reason, windows cannot read the actual size of SDCard is, its reading only the boot partition. To get rid of this problem, its advised to use SDFormatter.

2. Which image to Install ?

Default Raspberry pi gives two type of installation image.
        1. NOOB -- completely for beginner. I'd say for those who have no / less knowledge about linux.

        2. Raspbian -- A good place to start learning with Raspberry pi. Usually WHEEZY image is popular as starting. If you've smaller SDCard, and no requirement of Desktop, you may choose Jessie Lite minimum version.

ERROR - vSphere Client could not connect.

if you are running ESXi 5 / 5.5 [ I've experience only these two], you probably experience error as below image, with error message -

" vSphere Client could not connect to "XX.XX.XX.XX". An unknown connection error occurred. (The client could not send a complete request to the server. (The underlying connection was closed: An unexpected error occurred on a send.)) "

Hadoop changes on Single-Node Cluster Installations

There are many notes about HADOOP single node cluster installation, mostly in Ubuntu machine. All of them I've seen worked. But as time passed by, hadoop developer also made some structural and logical changes to fit the application better.

Here I wish to sum-up those changes (e.g. change of conf, file structure etc.) so newer user would get required commands or files easily while doing HADOOP signe node installation.


first to download hadoop =>
---------------------------------------------------
Best option is to search for nearest repository for hadoop from -

http://www.apache.org/dyn/closer.cgi/hadoop/common/

for me, below is the nearest

$ wget http://apache.lauf-forum.at/hadoop/common/hadoop-2.6.2/hadoop-2.6.2.tar.gz