I assume your talking about the I/O scheduler. Based on normal advice,
only change this if you have a "smart" device between the OS and the
Drives. A SATA controller usually qualifies. I have our DataNodes to to
NOOP to reduce the number of layers.
As always your mileage may vary and you should do some testing on your own.
On Tue, Apr 2, 2013 at 1:59 PM, Patai Sangbutsarakum <
[EMAIL PROTECTED]> wrote:
> Hello Hadoopers,
> Is anyone ever play linux io scheduler configuration in worker nodes?
> default for centos is cfq, there are 3 more to choose from.
> I wonder if we can play with those scheduler, probably we might get better
> performance ?
> hope this make sense.