Hey everyone. I have a doubt in mapreduce. In mapreduce each reduce task write its output to a file named part-r-nnnnn where nnnnn is a partition ID associated with the reduce task. Does map/reduce merge these files? If yes, how?
Hey there, instead of doing the file merging on your own, you can delegate the entire merging of the reduce output files by calling:
hadoop fs -getmerge /output/dir/on/hdfs/ /desired/local/output/file.txt
No, the files after the reduce phase are ...READ MORE
The map tasks created for a job ...READ MORE
It's preferable and generally, it is recommended ...READ MORE
du command is used for to see ...READ MORE
The command that you are running is ...READ MORE
In case of Hadoop, HDFS is used ...READ MORE
Firstly you need to understand the concept ...READ MORE
org.apache.hadoop.mapred is the Old API
org.apache.hadoop.mapreduce is the ...READ MORE
put <localSrc> <dest>
copyFr ...READ MORE
In your case there is no difference ...READ MORE
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