-Re: Is get a private case of scan ?
Amit Sela 2014-01-16, 07:23
I have a case where I want to "split" rows with a lot of qualifiers (a very
small amount of rows < 1%, with an exceptional number of qualifiers), into
a number of rows. Say like:
I was thinking of using a postGet() RegionObserver (the "split" rows will
always be stored in the same region) but when digging into the code I
noticed that Get is a Scan so I was wondering why not just scan for all
On Wed, Jan 15, 2014 at 10:53 PM, Stack <[EMAIL PROTECTED]> wrote:
> On Wed, Jan 15, 2014 at 5:34 AM, Amit Sela <[EMAIL PROTECTED]> wrote:
> > Hi all,
> > I was wondering if Get is implemented as a private case of scan ?
> > In HRegion, I see that the get passed is used to construct a Scan object
> > for the RegionScanner to use.
> A Get is a Scan, yes.
> > I was wondering if executing Scan(Get) vs Get from client api should have
> > any overhead ?
> There are differences in that Get will pread from HDFS where Scan will seek
> and read under lock (and only fall back to pread when it notices contention
> on the hfile).
> Why do you want to Scan(Get) instead of Get?