January 2016

Hadoop: When to Use it and When not to?

By | 2017-07-14T22:13:49+00:00 January 6th, 2016|Hadoop|

In the past couple of years, Hadoop has earned the title of “THE Big Data Analytics Platform”. To a lot of organizations, it is equal to the term Big Data Technology. But it can only do so much and savvy organizations need to analyze their needs in order to see if it is a good [...]

MapR: The Magic Which Drives Hadoop

By | 2017-07-14T22:14:01+00:00 January 1st, 2016|Hadoop|

When Google faced the trouble of analyzing huge datasets, such as web access logs and the page rank of a website. They used to employ an algorithmic approach which used to take up a lot of time and had to be re-done for every problem. So to get rid of it all, they tasked their [...]

December 2015

Hadoop Distributed File System

By | 2017-07-14T22:12:09+00:00 December 27th, 2015|Hadoop|

The Hadoop Distributed File System (HDFS) was developed following the distributed file system design principles. Running on commodity hardware, HDFS is extremely fault-tolerant and robust, unlike any other distributed systems. […]

Hadoop Architecture

By | 2017-07-14T22:11:54+00:00 December 25th, 2015|Hadoop|

Apache Hadoop is a java based open source software. Basically, it’s a framework which is used to execute batch processing jobs on huge clusters. It is designed so that it can be scaled from a single server to hundreds of thousands of nodes in the cluster, with a high extent of fault-tolerance. Rather than relying [...]

Some Hadoop Use Cases

By | 2017-07-14T22:11:36+00:00 December 20th, 2015|Hadoop|

The Big Data movement has been pretty amazing and also very exhaustive for potential beneficiaries. That said, every business owner needs to be educated about the impact of this tech on their yields. Hadoop has proved itself to be a very helpful tool for the Big Data Enthusiasts, although many have employed it to gain [...]

Hadoop vs RDBMS : Which one suits your needs?

By | 2017-07-14T22:11:18+00:00 December 17th, 2015|Hadoop|

The tech growth in the last decade has been so great that the things once considered inconceivable are now mainstream and the tasks too difficult that required a special skill set can now be completed by almost anyone. In the midst of it all, huge volumes of data are being produced every day, and, as [...]

December 2013

Format aborted in /app/hadoop/tmp/dfs/name

By | 2013-12-18T03:17:00+00:00 December 18th, 2013|Hadoop|

While startng the Hadoop i was just trying to format the filesystem. For that i have executed below command. bin/hadoop namenode -format But i am getting below error while doing this. Could you please let me know what could be the reason behind this. Warning: $HADOOP_HOME is deprecated. 13/08/10 13:52:56 INFO namenode.NameNode: STARTUP_MSG: /************************************************************ STARTUP_MSG: [...]

Hadoop Interview Question

By | 2013-12-18T03:15:34+00:00 December 18th, 2013|Hadoop|

What is the difference between start-all.sh and start-dfs.sh in Hadoop   There are different scripts in bin dir in Hadoop which is used to launch Hadoop DFS and Hadoop Map/Reduce Daemons. start-dfs.sh - Starts the Hadoop DFS daemons (Namenode and Datanodes) stop-dfs.sh - Stops the Hadoop DFS daemons (Namenode and Datanodes) start-all.sh - Starts all Hadoop daemons (Namenode, datanodes, [...]

September 2013

October 2012