Hi Praveeenesh, On Tue, Apr 19, 2011 at 07:06, praveenesh kumar <praveen...@gmail.com> wrote: > The input were 3 plain text files.. > > 1 file was around 665 KB and other 2 files were around 1.5 MB each..
That's not the Hadoop's sweet spot, with the default block size (64Mb), none of those files will be split, meaning they will only be processed by a single mapper and thus adding machines won't improve performance. Try with files that span several blocks, you should see a difference in perf when adding machines. Also the penalty of starting mappers and co won't be erased unless you have consequently sized files as input. Mathias.
