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 …
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 …
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 …
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 …
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?
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 …
python - How can I use the Map_Reduce chain instead of the "stuff ...
Jun 3, 2023 · How can I use mapreduce with this chain? Or is there any other way that can help me reduce the tokens being sent at a time? Secondly, I have noticed that sometimes the …
Difference between combiner and partitioner - Stack Overflow
Apr 11, 2019 · 9 I am a newbie to MapReduce and I just can't figure out the difference in the partitioner and combiner. I know both run in the intermediate step between the map and …