question MutlipleOutputs writing zero records to output file. in Archives of Support Questions (Read Only)

MutlipleOutputs writing zero records to output file.

Srini_D — Fri, 16 Sep 2022 09:34:48 GMT

I have mapreduce code, in which i have used multipleOutputs.write for writing the output fo my own file convention.

I have used following line.

multipleOutputs.write(new Text(line), NullWritable.get(),"srini-file");

But, i am getting file with srini-file-m-00000 with 0 records in it. However, if i have used context.write, then the output came properly.

Please let me know, if there is any important point i missed in multipleoutputs.

Re: MutlipleOutputs writing zero records to output file.

Harsh J — Tue, 21 Jul 2015 03:35:07 GMT

Are you ensuring to call multipleOutputs.close() in the cleanup phase? If that is not done, the file won't be closed up, and would be left hanging open for an hour during which you can't see any written data.

If you're already doing that, please share your code here so we can take a look at what may be going wrong.

Re: MutlipleOutputs writing zero records to output file.

Srini_D — Tue, 21 Jul 2015 04:21:42 GMT

Thank you Harsh