mapreduce

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Accessing .dat file from within a Jar file

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[详细]

2023-03-24 00:52 分类：问答
How efficient are opensource computation platform like Hadoop etc.?

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[详细]

2023-03-23 16:52 分类：问答
Streaming or custom Jar in Hadoop

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[详细]

2023-03-23 15:38 分类：问答
Hadoop read from standard input stream

I want my MapReduce program to read from the standard input strea开发者_StackOverflowm (System.in)[详细]

2023-03-23 09:01 分类：问答
java.io.IOException: error=2, No such file or directory eroor in Hadoop streaming

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[详细]

2023-03-22 19:10 分类：问答
Parallel reducing with Hadoop mapreduce

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[详细]

2023-03-22 15:49 分类：问答
Problem with Hadoop Streaming -file option for Java class files

I am struggling with a very basic issue in hadoop streaming in the \"-file\" option. First I tried the very basic example in streaming:[详细]

2023-03-22 10:29 分类：问答
How do I make an external reference table or database available to a Hadoop MapReduce job?

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.[详细]

2023-03-22 08:50 分类：问答
Sending a variable to the Mapper Class

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[详细]

2023-03-22 07:48 分类：问答
Bad Performance for Dedupe of 2 million records using mapreduce on Appengine

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[详细]

2023-03-22 07:29 分类：问答