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HBase >> mail # user >> Why InternalScanner doesn't have a method that returns entire row or object of Result


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anil gupta 2012-11-30, 18:54
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anil gupta 2012-11-30, 21:53
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Ted Yu 2012-12-01, 01:20
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anil gupta 2012-12-01, 02:01
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Asaf Mesika 2013-03-07, 12:34
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RE: Why InternalScanner doesn't have a method that returns entire row or object of Result
Asaf
     You are correct!
You mean the RegionScanner I think..  The 'limit' is applied at this level. HRegion$RegionScannerImpl

-Anoop-
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From: Asaf Mesika [[EMAIL PROTECTED]]
Sent: Thursday, March 07, 2013 6:04 PM
To: [EMAIL PROTECTED]
Subject: Re: Why InternalScanner doesn't have a method that returns entire row or object of Result

Guys,
Just to make things clear:

if I have a row which have 12 keys values, and then another row with 5 KVs,
and I called InternelScanner(results, 10), where 10 is the limit, then I
would get:
1. 10 KV of the 1st row
2. 2 KV of the 1st row
3. 5 KV of the 2nd row

Is this correct?

On Sat, Dec 1, 2012 at 4:01 AM, anil gupta <[EMAIL PROTECTED]> wrote:

> Hi Ted,
>
> I figured out that i have to use next from InternalScanner. Thanks for the
> response.
> The comment for method "Grab the next row's worth of values." was a little
> confusing to me.
> "Get the keyValue's for the next row" would have been better. Just
> saying....
>
> Thanks,
> Anil
>
> On Fri, Nov 30, 2012 at 5:20 PM, Ted Yu <[EMAIL PROTECTED]> wrote:
>
> > Right.
> >
> > Take a look at AggregateImplementation.getAvg(), you would see how the
> > following method is used.
> >
> > On Fri, Nov 30, 2012 at 1:53 PM, anil gupta <[EMAIL PROTECTED]>
> wrote:
> >
> > > Does this method in InternalScanner gets KeyValue's for only 1 row in 1
> > > call. Am i right?
> > >
> > > boolean *next<
> > >
> >
> http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/regionserver/InternalScanner.html#next%28java.util.List%29
> > > >
> > > *(List<
> > >
> >
> http://download.oracle.com/javase/6/docs/api/java/util/List.html?is-external=true
> > > >
> > > <KeyValue<
> > > http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/KeyValue.html>
> > > > results)
> > >           Grab the next row's worth of values.
> > >
> > >
> >
> http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/regionserver/InternalScanner.html
> > >
> > > Thanks,
> > > Anil Gupta
> > >
> > > On Fri, Nov 30, 2012 at 10:54 AM, anil gupta <[EMAIL PROTECTED]>
> > > wrote:
> > >
> > > > Hi All,
> > > >
> > > > I am developing a Coprocessor to sort results on the basis of Cell
> > Value.
> > > > Basically an equivalent of order by clause in RDBMS.
> > > > In my subclass of BaseEndpointCoprocessor i would like to do fetch of
> > > > entire rows rather than individual KeyValue using the
> InternalScanner.
> > > But,
> > > > surprisingly there is no method to do that. Can any one tell me why
> we
> > > dont
> > > > have a method for fetching rows? What is the most optimized way to
> > fetch
> > > > rows through current InternalScanner methods?
> > > > --
> > > > Thanks & Regards,
> > > > Anil Gupta
> > > >
> > >
> > >
> > >
> > > --
> > > Thanks & Regards,
> > > Anil Gupta
> > >
> >
>
>
>
> --
> Thanks & Regards,
> Anil Gupta
>
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB