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Subject: Re: Slow full-table scans
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From: Gurjeet Singh <gurjeet@gmail.com>
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Date: Sun, 12 Aug 2012 07:23:28 -0700
To: "user@hbase.apache.org" <user@hbase.apache.org>
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Hi Ted,

Yes, I am using the cloudera distribution 3.

Gurjeet

Sent from my iPad

On Aug 12, 2012, at 7:11 AM, Ted Yu <yuzhihong@gmail.com> wrote:

> Gurjeet:
> Can you tell us which HBase version you are using ?
> 
> Thanks
> 
> On Sun, Aug 12, 2012 at 5:32 AM, Gurjeet Singh <gurjeet@gmail.com> wrote:
> 
>> Thanks for the reply Stack. My comments are inline.
>> 
>>> You've checked out the perf section of the refguide?
>>> 
>>> http://hbase.apache.org/book.html#performance
>> 
>> Yes. HBase has 8GB RAM both on my cluster as well as my dev machine.
>> Both configurations are backed by SSDs and Hbase options are set to
>> 
>> HBASE_OPTS="-ea -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode"
>> 
>> The data that I am dealing with is static. The table never changes
>> after the first load.
>> 
>> Even some of my GET requests are taking up to a full 60 seconds when
>> the row sizes reach ~10MB. In general, taking 5 seconds to fetch a
>> single row (~1MB) seems a extremely high to me.
>> 
>> Thanks again for your help.
>>