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HBase >> mail # user >> Performance degrades on moving from desktop to blade environment

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Re: Performance degrades on moving from desktop to blade environment
We had issues of moving into 32 core AMD box also.  The issue was
revolving around datanode getting slow after about 12 hours.  What you
need to do is check fsreadlatency_ave_time graph, if it appears spiky
then you have a problem with IO, next get a graph of "Runnable
Threads"  they should be flatlining, if they are spiking you might
have IO/Memory contention.  Run RAM tests head to head, we found our
32 Core ECC RAM would always underperform while using sysbench, by a
large margin.


On Mon, May 16, 2011 at 10:33 AM, Himanish Kushary <[EMAIL PROTECTED]> wrote:
> Hi,
> We are in the process of moving a small Hbase/Hadoop cluster from our
> development to production environment.Our development environment were few
> intel desktops (8 cores CPU/8 Gigs RAM/7200 rpm disks) running centOS while
> the production environment are blades with (24 cores AMD CPU/32 gigs
> RAM/15000 rpm disks) AMD architecture running centOS.
> Strangely the hbase performance seems to degrade after moving stuffs to the
> production enviroment (suppoesed to have more horse power).We are using the
> latest and default installation for cloudera version of hadoop and hbase.No
> changes to memory or other parameter were done on both the environment.
> Any idea what could cause this.Could the AMD architecture be the
> cause.Pointers to things to look for to improve performance in the
> production cluster would be really appreciated.
> Note: We ran "count" from hbase shell on a huge table and found the desktops
> to be performing much better. We are in the process of comparing Map-Reduces
> presently.
> ---------------------------
> Thanks & Regards
> Himanish