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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: pread vs. using seek()+read()
Date Mon, 12 Mar 2012 18:31:51 GMT
On top of that I've always been wondering if pushing down the
pre-caching would help, like if you know you want to send back 1000
rows then read a bigger chunk of data from HDFS.

J-D

On Sun, Mar 11, 2012 at 3:01 PM, Stack <stack@duboce.net> wrote:
> On Sun, Mar 11, 2012 at 1:49 PM, Ted Yu <yuzhihong@gmail.com> wrote:
>> I wonder if there was recent performance comparison for scan between using
>> pread vs. using seek()+read().
>>
>
> No.
>
> Nothing has changed in pread vs seek+read as far as I know so you'll
> probably just end up confirming seek+read is still faster than pread
> when scanning.
>
> To improve scan speed, we need read ahead I'd say.
>
> St.Ack

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