Top "Combiners" questions

combiner and reducer can be different?

In many MapReduce programs, I see a reducer being used as a combiner as well. I know this is because …

mapreduce reducers combiners

“Combiner" Class in a mapreduce job

A Combiner runs after the Mapper and before the Reducer,it will receive as input all data emitted by the …

hadoop mapreduce reducers combiners

Multiple git commands in single command executed in order they are encountered by compiler

I have following list of commands that I run in respective order so that a source project can be committed …

bash git-bash combiners git

Hadoop combiner sort phase

When running a MapReduce job with a specified combiner, is the combiner run during the sort phase? I understand that …

hadoop mapreduce combiners

How can I combine rows within the same data frame in R (based on duplicate values under a specific column)?

Sample of 2 (made-up) example rows in df: userid facultyid courseid schoolid 167 265 NA 1678 167 71111 301 NA Suppose that I have a couple hundred …

r duplicates append combiners