How does the MapReduce sort algorithm work? - Stack Overflow
MapReduce's use of input files and lack of schema support prevents the performance improvements enabled by common database system features such as B-trees and hash …
mapreduce - What is Hive: Return Code 2 from …
I am getting: FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.MapRedTask While trying to make a copy of a partitioned …
frameworks - Simple explanation of MapReduce? - Stack Overflow
Aug 26, 2008 · MapReduce is a method to process vast sums of data in parallel without requiring the developer to write any code other than the mapper and reduce functions. The map function …
Setting the number of map tasks and reduce tasks - Stack Overflow
Jul 31, 2011 · For each input split a map task is spawned. So, over the lifetime of a mapreduce job the number of map tasks is equal to the number of input splits. mapred.map.tasks is just a …
mapreduce - How to optimize shuffling/sorting phase in a hadoop …
Dec 10, 2015 · mapreduce.reduce.shuffle.input.buffer.percent: How much of heap should be used for storing the map output, during the shuffle phase in the reducer. This setting determines the …
c# - Map and Reduce in .NET - Stack Overflow
Jan 9, 2009 · What scenarios would warrant the use of the "Map and Reduce" algorithm? Is there a .NET implementation of this algorithm?
Good MapReduce examples - Stack Overflow
Sep 12, 2012 · MapReduce is a framework originally developed at Google that allows for easy large scale distributed computing across a number of domains. Apache Hadoop is an open …
what are the disadvantages of mapreduce? - Stack Overflow
Sep 3, 2013 · What are the disadvantages of mapreduce? There are lots of advantages of mapreduce. But I would like to know the disadvantages of mapreduce too.
python - How to change the version of ... - Stack Overflow
Apr 22, 2020 · By default spark (2.4.4) use MapReduce.fileoutputcommitter.algorithm.version 1. I am trying it to change it to version 2. spark-UI and sparkCtx._conf.getAll() shows version 2 but …
mapreduce - Map / Reduce Tasks are failing extensively. Task Id ...
Nov 2, 2017 · I am new to Hadoop. My Laptop is 32GB, Core i5, 4 core processor. I have created multinode (3 data Node) apache hadoop cluster 2.7.4 on that by virtual machines. I have …