BLOG – Page 9 – Hadoop In Real World

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September 1, 2015

Can Reducer always be reused for Combiner?

Can Reducer always be reused for Combiner? A Combiner function is an optional intermediary function which is executed on the Map phase right after the execution […]
August 30, 2015

HDFS Federation

What is HDFS Federation? Namenode is responsible for the successful operation of HDFS.  Namenode holds the entire metadata of HDFS, which includes information about files and […]
August 26, 2015

Reading A File From HDFS – Java Program

Reading A File From HDFS – Java Program In this last post we saw how to write a file to HDFS by writing our own Java […]
August 23, 2015

Writing A File To HDFS – Java Program

Writing A File To HDFS – Java Program   Writing a file to HDFS is very easy, we  can simply execute [crayon-5a121c81dd19f903204746-i/]  command to copy a file […]
August 16, 2015

Speculative Execution

What is Speculative Execution? Sometimes you will notice that a Job which has 3 input splits executed 4 mappers and killed the 4th mapper. The job […]
August 11, 2015

Changing Number Of Reducers

Changing Number Of Reducers In this blog post we saw how we can change the number of mappers in a MapReduce execution. In this post, we […]