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From Varun Sharma <va...@pinterest.com>
Subject Re: Question about HFile seeking
Date Thu, 16 May 2013 21:42:32 GMT
Nothing, I am just curious...

So, we will do a bunch of wasteful scanning - that's lets say row1 has col1
- col100000 - basically 100K columns, we will scan all those key values
even though we are going to discard them, is that correct ?


On Thu, May 16, 2013 at 2:30 PM, Stack <stack@duboce.net> wrote:

> What you seeing Varun (or think you are seeing)?
> St.Ack
>
>
> On Thu, May 16, 2013 at 2:30 PM, Stack <stack@duboce.net> wrote:
>
> > On Thu, May 16, 2013 at 2:03 PM, Varun Sharma <varun@pinterest.com>
> wrote:
> >
> >> Or do we use some kind of demarcator b/w rows and columns and timestamps
> >> when building the HFile keys and the indices ?
> >>
> >
> > No demarcation but in KeyValue, we keep row, column family name, column
> > family qualifier, etc., lengths and offsets so the comparators on ly
> > compare pertinent bytes.
> >
> > If you doing a prefix scan w/ row1c, we should be starting the scan at
> > row1c, not row1 (or more correctly at the row that starts the block we
> > believe has a row1c row in it...).
> >
> > St.Ack
> >
>

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