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From Hari Sreekumar <hsreeku...@clickable.com>
Subject Re: Stats to look out for while running mapreduce jobs with HBase
Date Fri, 12 Nov 2010 19:26:30 GMT
The current job is a bulk insert job and yes, I have some orange sections
(cpu-wio) in my cpu report during the job. So this could mean either IO or
network could be the bottleneck right? I'll post more details and ganglia
reports soon.

On Sat, Nov 13, 2010 at 12:26 AM, Jean-Daniel Cryans <jdcryans@apache.org>wrote:

> The most important:
>
>  - no swap, as is zero, none, nada
>  - near 0 io wait
>
> Then it's about making sure that you can drive your user CPU to near
> 100%. If you can't, then you have a bottle neck somewhere and there's
> no magical way of finding it out. It usually starts by understanding
> what you're doing (is your job mostly just mapping or it's inserting
> aggressively?) and then figuring via debugging or log reading what
> seems to be the holdup.
>
> J-D
>
> On Thu, Nov 11, 2010 at 9:05 PM, Hari Sreekumar
> <hsreekumar@clickable.com> wrote:
> > Hi,
> >
> >       I am quite new to hadoop and hbase, and I am having a hard time
> here
> > figuring out some issues with my cluster, and I am pretty sure many of
> you
> > have gone through many of the problems I am facing right now. I need some
> > help in figuring out what exactly are the bottlenecks in my system. I
> have
> > set up regular ganglia on my cluster (simple ganglia, not able to track
> > hadoop/hbase metrics yet.. that's another issue). What are the stats that
> > matter the most? How to go about making inferences from these reports? I
> > know that swapping is a very important parameter to monitor. What are the
> > other important parameters, what is their significance, and what should
> be
> > their values ideally be, approximately? Mainly memory cached, cpu loads,
> > memory buffered, Total memory, Network usage etc. and also any other
> > parameter that you found to be useful in these cases. I think this would
> be
> > very helpful for many people in figuring out many issues. Thanks a ton,
> >
> > hari
> >
>

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