How much memory it have and how many maps and reducer you have set with how much heap size? On Aug 11, 2014 11:17 AM, "Sindhu Hosamane" <sindh...@gmail.com> wrote:
> Hello, > > I have set up multiple datanodes on a single machine following the > instructions in http://mail-archives.apache.org/mod_mbox/hadoop- > common-user/201009.mbox/%3CA3EF3F6AF24E204B812D1D24CCC8 > d71a03688...@mse16be2.mse16.exchange.ms%3E > So i see 2 datanodes up and running when i run jps command. > The machine on which i set this 2 datanode hadoop is very powerful - means > it has 96 cores . > But still i dont get significant performance from 2 datanodes . How do i > make sure 2 datanodes are being used. > Or why does performance fail with 2 datanodes on same machine even when i > work on a powerful machine? > > Because before tweaking hadoop with those mapped properties to improve > performance, i want know if i get any performance from 2 datanodes(since i > am working on a powerful server) > > Any of your advices would be helpful. > >
