hbase-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Performance Tuning Tips?
Date Tue, 20 Oct 2009 16:52:36 GMT
Scanner caching is in fact pre-fetching.

J-D

On Tue, Oct 20, 2009 at 9:44 AM, Ananth T. Sarathy
<ananth.t.sarathy@gmail.com> wrote:
> will do. Is there any other property for setting the cache time out? also is
> there any way to precache ?
> Ananth T Sarathy
>
>
> On Tue, Oct 20, 2009 at 12:27 PM, Jean-Daniel Cryans <jdcryans@apache.org>wrote:
>
>> Well since you are using S3 it's not like adding more nodes adds more
>> spindles, you only really distribute the HBase-side processing. Also,
>> a count is a sequential operation so it's not distributed (you only
>> hit one node at a time). To speed up scans you can increase scanner
>> caching.
>>
>> J-D
>>
>> On Tue, Oct 20, 2009 at 9:23 AM, Ananth T. Sarathy
>> <ananth.t.sarathy@gmail.com> wrote:
>> > So, I have added 3 region servers, and I am not getting any real
>> performance
>> > increases.. Does anyone have any other tips? I checked the wiki, but we
>> are
>> > doing what is applicable to us.  Is there any way check latency on s3,
>> and
>> > are the any jobs that could be run to increase performance for things
>> like
>> > count? (we only have like 27k rows right now, and it's terribly slow,
>> which
>> > is weird, because it was fast for a while, and suddenly slowed down )
>> > Ananth T Sarathy
>> >
>>
>

Mime
View raw message