mapreduce

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How to keep only a defined subset of a collection

I would like to keep only a defined subset of a collection. I don\'t find any relevant information about it. It\'s hard to explain, so I put an exemple:[详细]

2023-04-12 00:14 分类：问答
Hadoop Sort map and reduce key value

If I had a file with random integers on ea开发者_运维百科ch line and wanted to sort the file using Hadoop, what would my mapper and reducer\'s input/output key and value be?Yahoo has sorted Peta and T[详细]

2023-04-11 16:08 分类：问答
Hadoop eclipse plugin : Unable to see output on console

I am using hadoop-0.20.2 from http://www.apache.org/dyn/closer.cgi/hadoop/common/ and I\'m using the following Eclipse plugin hadoop-0.20.1-eclipse-plugin.jar from http://code.google.com/p/hadoop-ecli[详细]

2023-04-11 03:11 分类：问答
Sort Using Map and Reduce Techinques

Given a huge data set of integers, what would be the advantages of using map and reduce techniques over traditional sorting algorithms such as q开发者_开发问答uicksort and mergesort?Map/reduce is more[详细]

2023-04-11 01:08 分类：问答
Running MongoDB Queries in Map/Reduce

Is it possible to run MongoDB commands like a query to grab additional data or to do an update from with in MongoDB\'s MapReduce command.Either in the Map or the Reduce function?[详细]

2023-04-10 21:45 分类：问答
MapReduceBase and Mapper deprecated

public static class Map extends MapReduceBase i开发者_开发技巧mplements Mapper MapReduceBase, Mapper and JobConf are deprecated in Hadoop 0.20.203.[详细]

2023-04-10 16:31 分类：问答
Python Streaming : how to reduce to multiple outputs?(its possible with Java though)

I read Hadoop in Action and found that in Java using MultipleOutputFormat and MultipleOutputs classes we can reduce the data to multiple files but what I am not sure is how to achieve the same thing u[详细]

2023-04-10 01:08 分类：问答
Hadoop: what should be mapped and what should be reduced?

This is my first time using map/reduce. I want to write a program that processes a large log file. For example, if I was processing a log file that had records consisting of {Student, College, and GPA[详细]

2023-04-09 06:33 分类：问答
mongodb map reduce value.count

In mongodb, I have a map function as below: var map = function() { emit( this.username, {count: 1, otherdata:otherdata} );[详细]

2023-04-09 04:57 分类：问答
Is it better to use the mapred or the mapreduce package to create a Hadoop Job?

To create MapReduce jobs you can either use the old org.apache.hadoop.mapred package or the newer org.apache.hadoop.mapreduce package for Mappers and Reducers, Jobs ... The first one had been ma开发者[详细]

2023-04-09 02:37 分类：问答