Top "Mapreduce" questions

MapReduce is an algorithm for processing huge datasets on certain kinds of distributable problems using a large number of nodes

No such method exception Hadoop <init>

When I am running a Hadoop .jar file from the command prompt, it throws an exception saying no such method …

java hadoop mapreduce
Running a job using hadoop streaming and mrjob: PipeMapRed.waitOutputThreads(): subprocess failed with code 1

Hey I'm fairly new to the world of Big Data. I came across this tutorial on http://musicmachinery.com/2011/09/04/how-to-process-a-million-songs-in-20…

python hadoop mapreduce hadoop-streaming mrjob
What is the fastest way to bulk load data into HBase programmatically?

I have a Plain text file with possibly millions of lines which needs custom parsing and I want to load …

java hadoop mapreduce hbase
Pig vs Hive vs Native Map Reduce

I've basic understanding on what Pig, Hive abstractions are. But I don't have a clear idea on the scenarios that …

hadoop mapreduce hive apache-pig
About Hadoop/HDFS file splitting

Want to just confirm on following. Please verify if this is correct: 1. As per my understanding when we copy a …

hadoop mapreduce
how to sort word count by value in hadoop?

hi i wanted to learn how to sort the word count by value in hadoop.i know hadoop takes of …

hadoop mapreduce bigdata partitioner
Passing parameters to map function in Hadoop

I am new to Hadoop. I want to access a command line argument from main function(Java program) inside the …

java hadoop mapreduce parameter-passing
Checksum Exception when reading from or copying to hdfs in apache hadoop

I am trying to implement a parallelized algorithm using Apache hadoop, however I am facing some issues when trying to …

apache hadoop mapreduce
Run Hadoop job without using JobConf

I can't find a single example of submitting a Hadoop job that does not use the deprecated JobConf class. JobClient, …

java hadoop mapreduce
Does MongoDB's $in clause guarantee order

When using MongoDB's $in clause, does the order of the returned documents always correspond to the order of the array …

mongodb mongoose mapreduce mongodb-query aggregation-framework