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Posted to common-user@hadoop.apache.org by maha <ma...@umail.ucsb.edu> on 2011/03/22 21:45:09 UTC

Re: Mappers and RecordReaders

Thanks Harsh :) I'll try it. Also, I'm wondering which of the following is true:

When I set a whole file as a split for a mapper, 

1) is the file only opened and the record reader reads from disk record by record ?

2) Or Part of the file is read into memory and the record reader get the record-by-record from memory ?

Assuming the single-thread mapper class.

Thanks,
Maha


On Mar 22, 2011, at 11:22 AM, Harsh J wrote:

> NullOutputFormat