hbase-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Rita <rmorgan...@gmail.com>
Subject Re: speeding up rowcount
Date Sun, 09 Oct 2011 15:30:39 GMT
Thanks for the responses.

Where do I set the high Scan cache values?


On Sun, Oct 9, 2011 at 11:19 AM, Himanshu Vashishtha <
hvashish@cs.ualberta.ca> wrote:

> Since a MapReduce is a separate process, try with a high Scan cache value.
>
> http://hbase.apache.org/book.html#perf.hbase.client.caching
>
> Himanshu
>
> On Sun, Oct 9, 2011 at 9:09 AM, Ted Yu <yuzhihong@gmail.com> wrote:
> > I guess your hbase.hregion.max.filesize is quite high.
> > If possible, lower its value so that you have smaller regions.
> >
> > On Sun, Oct 9, 2011 at 7:50 AM, Rita <rmorgan466@gmail.com> wrote:
> >
> >> Hi,
> >>
> >> I have been doing a rowcount via mapreduce and its taking about 4-5
> hours
> >> to
> >> count a 500million rows in a table. I was wondering if there are any map
> >> reduce tunings I can do so it will go much faster.
> >>
> >> I have 10 node cluster, each node with 8CPUs with 64GB of memory. Any
> >> tuning
> >> advice would be much appreciated.
> >>
> >>
> >> --
> >> --- Get your facts first, then you can distort them as you please.--
> >>
> >
>



-- 
--- Get your facts first, then you can distort them as you please.--

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message