I\'m just getting started with mongo and map/reduce, and I\'m coming into the following error when using pymongo that I don\'t get when using the mongo command line directly (I realize there is a simi
I\'m doing some very simple data mining 开发者_开发百科(actually, just a wordcound) as my research project for undergrad program.
I try to implement the word count example by myself, here\'s my implementation of the mapper: public static class Map extends Mapper<LongWritable, Text, Text, IntWritable> {
I\'m trying to chain maps and reduces phases in one job. The problem is that I\'m running under hadoop 0.20.2 and the package org.apache.hadoop.mapred.lib.Chain seems to be deprecated and replaced by
We have a site that contains streaming video and we want to display three reports of most watched videos in the last week, month and year (a rolling window).
I\'m migrating an existing Rails app to use MongoDB (with Mongoid), and I\'m having some trouble figuring out how to do aggregations like you can do with MySQL.
I don\'t understand 开发者_运维技巧what types of apps can be used with Hadoop.Does each task have to be tailored for hadoop/mapreduce.For example, can you just associate any long running java processe
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How do I implement a web search using Hadoop/Hbase. Can anyone please provide me some guidelines or tutorial just to get s开发者_开发知识库tarted?this article is about map-Reduce, and it gives some ex
I have a collection of events=[ timestamp, accountId, deviceId, rfid ...] -rfids is nullable, but everything else is not nullable
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