frameworks - Simple explanation of MapReduce? - Stack Overflow
May 23, 2017 · The reason MapReduce is split between Map and Reduce is because different parts can easily be done in parallel. (Especially if Reduce has certain mathematical …
Newest 'mapreduce' Questions - Stack Overflow
Im running a Hadoop Mapreduce program to calculate the average, maximum and minimum temperature. Temperature is stored in input1.csv file with three columns Date in YYYY-MM …
what are the disadvantages of mapreduce? - Stack Overflow
Mar 6, 2014 · There are some disadvantages of MapReduce, MapReduce is not suitable for real-time calculations and stream computing. It is designed for batch processing of large datasets, …
mapreduce - Does Spark internally use Map-Reduce? - Stack …
Feb 3, 2019 · Actually spark use DAG(Directed Acyclic Graph) not tradicational mapreduce. You can think of it as an alternative to Map Reduce. While MR has just two steps (map and …
mapreduce - Get index of given element in array field in MongoDB ...
Oct 13, 2015 · There is no server side alternate ( also already stated ), so you are either stuck with mapReduce in the "server side" case or you process the index of array per document in …
language agnostic - What is Map/Reduce? - Stack Overflow
MapReduce is a programming model and an associated implementation for processing and generating large data sets. Users specify a map function that processes a key/value pair to …
mapreduce - What is Hive: Return Code 2 from org ... - Stack …
In my case, the solution was adding more RAM Memory to the Virtual Machines. Sometimes code 2 means that Map and Reduce nodes do not have enough memory. Another option could be …
mapreduce - Hadoop WordCount example stuck at map 100
Apr 15, 2012 · My MapReduce job become Fails. 0. map 100% reduce 0% in running hadoop word count. 15. Wordcount program ...
mapreduce - hadoop map reduce secondary sorting - Stack …
Aug 23, 2013 · Here is an example for grouping. Consider a composite key (a, b) and its value v.And let's assume that after sorting you end up, among others, with the following group of …
mapreduce - Hadoop Map Reduce read a text file - Stack Overflow
Apr 8, 2023 · I'm trying to write a MapReduce program that can read an input file and write the output to another text file. I'm planning to use the BufferedReader class for this. But I don't …