I am new to MapReduce. I have a doubt. Does the setup & cleanup methods are executed after each map & reduce task.
Setup & cleanup methods are executed after each task, as task are executed on separate machines. If a method throws an exception, it will be skipped for that particular task.
A Zero reducer as the name suggests ...READ MORE
Differences are as follows:
Hadoop's MR can be ...READ MORE
Doc on Hadoop Streaming : http://hadoop.apache.org/docs/r1.2.1/streaming.html
Hadoop streaming is ...READ MORE
Writable in an interface in Hadoop and types ...READ MORE
Firstly you need to understand the concept ...READ MORE
put <localSrc> <dest>
copyFr ...READ MORE
In your case there is no difference ...READ MORE
The distributed copy command, distcp, is a ...READ MORE
mr-jobhistory-daemon. sh start historyserver READ MORE
HDFS is a distributed file system whereas ...READ MORE