How to get Mapreduce output in a single file instead of multiple files in Hadoop Cluster on Google Cloud? -

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when running jar on local hadoop multi-node cluster, can see output reducer output , single file every job.

when run same jar on google cloud, multiple output files (part-r-0000*). instead need output written single file. how do that?

well 1 simple solution configure job run 1 reducer. seems on google cloud default setting different. see here how that: setting number of reducers in mapreduce job in oozie workflow

another way deal have concatenating script run @ end of map reduce job pieces part-r files, ie 

cat *part-r* >>alloutput

may bit more complex if have headers , need copy local first.


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