I am trying to access a data file from a public class, both of which are located within a JAR file. However, when I execute the 开发者_如何学JAVAjar on a Hadoop cluster, the system throws a FileNotFou
How effi开发者_如何学编程cient are opensource distributed computation frameworks like Hadoop? By efficiency, I mean CPU cycles that can be used for the \"actual job\" in tasks that are mostly pure com
I\'m running a streaming job in Hadoop (on Amazon\'s EMR) with the mapper and reducer written in Python. I want to know about the speed gains I would experience if I implement the same mapper and redu
I want my MapReduce program to read from the standard input strea开发者_StackOverflowm (System.in)
Please help with the \"-file\" option issue of hadoop streaming (mentioned in the link below). just to update, I know that the jar is already there, I am trying this after I tried hadoop-streaming for
I\'m using Hadoop\'s MapReduce.I have a a file as an input to the map function, the map function does something (not relevant for the question).I\'d like my reducer to take the map\'s output and write
I am struggling with a very basic issue in hadoop streaming in the \"-file\" option. First I tried the very basic example in streaming:
I am analyzing a large amount of files in a Hadoop MapReduce job, with the input files being in .txt format. Both my mapper and my reducer are written in Python.
I am trying to get an input from the开发者_如何学编程 user and pass it to my mapper class that I have created but whenever the value always initialises to zero instead of using the actual value the us
I have about 2 million records which have about 4 string fields each which needs to be checked for duplicates. To be more specific I have name, phone, address and fathername as fields and I must check
加载中,请稍侯......