Hi,
     is there any easy way to know how many records in the hbase, hive or
coprocessor?

     Thanks!

     beatls

using Coprocessor: rowcount
On Sat, Jan 5, 2013 at 2:23 AM, hua beatls <[EMAIL PROTECTED]> wrote:

> Hi,
>      is there any easy way to know how many records in the hbase, hive or
> coprocessor?
>
>      Thanks!
>
>      beatls
>

hi hua,
using command

$ bin/hbase org.apache.hadoop.hbase.mapreduce.RowCounter <tablename>
[<column1> <column2>...]

it will report you the ROWS.
or you can write a MapReduce tool yourself to count the rows.

or you can run command in hbase shell:
hbase(main):005:0> scan 't1',FILTER=>"FirstKeyOnlyFilter()"
...
6 row(s) in 0.0730 seconds
this is a alternative choice for row count.

see HBase Reference Guide Chinese version: http://abloz.com/hbase/book.html

Andy

2013/1/5 Azuryy Yu <[EMAIL PROTECTED]>

> using Coprocessor: rowcount
>
>
> On Sat, Jan 5, 2013 at 2:23 AM, hua beatls <[EMAIL PROTECTED]> wrote:
>
> > Hi,
> >      is there any easy way to know how many records in the hbase, hive or
> > coprocessor?
> >
> >      Thanks!
> >
> >      beatls
> >
>

Hi,
   do you have any guide about copreccesor? how to use it?
   Thanks!

    beatls

On Sat, Jan 5, 2013 at 8:51 AM, Azuryy Yu <[EMAIL PROTECTED]> wrote:

> Coprocessor: rowcount

Hi,

See here https://blogs.apache.org/hbase/entry/coprocessor_introduction for
Coprocessor Introduction.
It's the first place you should look for . It has couple of example as well
**Happy New Year**

Regards,
Alok
On Sat, Jan 5, 2013 at 12:42 PM, hua beatls <[EMAIL PROTECTED]> wrote:

> Hi,
>    do you have any guide about copreccesor? how to use it?
>
>
>    Thanks!
>
>     beatls
>
> On Sat, Jan 5, 2013 at 8:51 AM, Azuryy Yu <[EMAIL PROTECTED]> wrote:
>
> > Coprocessor: rowcount
>

--
Alok Kumar

Hi Hua,

The record number is not an information stored with the row itself. So
the idea here is to count how many rows are there before the one you
are looking at.

And if you insert one or some before, you will have to recount. At the
end, this can be still a costly information.

Are you sure you can't use something else for your usecase?

JM

2013/1/5, Alok Kumar <[EMAIL PROTECTED]>:
> Hi,
>
> See here https://blogs.apache.org/hbase/entry/coprocessor_introduction for
> Coprocessor Introduction.
> It's the first place you should look for . It has couple of example as well
>
>
> **Happy New Year**
>
> Regards,
> Alok
>
>
>
>
> On Sat, Jan 5, 2013 at 12:42 PM, hua beatls <[EMAIL PROTECTED]> wrote:
>
>> Hi,
>>    do you have any guide about copreccesor? how to use it?
>>
>>
>>    Thanks!
>>
>>     beatls
>>
>> On Sat, Jan 5, 2013 at 8:51 AM, Azuryy Yu <[EMAIL PROTECTED]> wrote:
>>
>> > Coprocessor: rowcount
>>
>
>
>
> --
> Alok Kumar
>