-Re: Scan with Filter
Weishung Chung 2011-01-18, 21:24
Thank you :)
On Tue, Jan 18, 2011 at 12:49 PM, Jonathan Gray <[EMAIL PROTECTED]> wrote:
> The API shows one row per next() call but the number of rows fetched per
> RPC can be configured much higher with Scan.setCaching().
> Filters are basically just server-side predicates that will dictate which
> rows/columns/values will be returned to the client. This does not relate to
> the number of rows sent per RPC. See
> http://hbase.apache.org/docs/current/api/org/apache/hadoop/hbase/filter/package-summary.htmlfor more information about filters.
> > -----Original Message-----
> > From: Weishung Chung [mailto:[EMAIL PROTECTED]]
> > Sent: Tuesday, January 18, 2011 8:31 AM
> > To: [EMAIL PROTECTED]
> > Subject: Scan with Filter
> > I have some questions about the way Hbase returns results. When we use
> > HTable getScanner(Scan), it looks like it only retrieves 1 row per next()
> > which is different from how jdbc returns the resultset. If I set the
> Filter on
> > the Scan, could it return a set of rows in one connection call? It looks
> like the
> > ClientScanner does not make use of the Filter. Only the Scan uses the
> Filter in
> > the readFields method. Please correct me if i am wrong about this.
> > Thank you so much.