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From: Cyril Scetbon <cyril.scetbon@free.fr>
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Subject: Re: Coprocessor POC
Date: Mon, 30 Jul 2012 18:43:41 +0200
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Thanks, it's really better !=20

I've read that by default it supports only Long values, that's why I was =
using a null ColumnInterpreter.

Regards.
Cyril SCETBON

On Jul 30, 2012, at 5:56 PM, Himanshu Vashishtha =
<hvashish@cs.ualberta.ca> wrote:

> On Mon, Jul 30, 2012 at 6:55 AM, Cyril Scetbon <cyril.scetbon@free.fr> =
wrote:
>=20
>> I've given the values returned by scan 'table' command in hbase shell =
in my first email.
> Somehow I missed the scan result in your first email. So, can you pass
> a LongColumnInterpreter instance instead of null?
> See TestAggregateProtocol methods for usage.
>=20
> Thanks
> Himanshu
>=20
>>=20
>> Regards
>> Cyril SCETBON
>>=20
>> On Jul 30, 2012, at 12:50 AM, Himanshu Vashishtha =
<hvashish@cs.ualberta.ca> wrote:
>>=20
>>> And also, what are your cell values look like?
>>>=20
>>> Himanshu
>>>=20
>>> On Sun, Jul 29, 2012 at 3:54 PM,  <yuzhihong@gmail.com> wrote:
>>>> Can you use 0.94 for your client jar ?
>>>>=20
>>>> Please show us the NullPointerException stack.
>>>>=20
>>>> Thanks
>>>>=20
>>>>=20
>>>>=20
>>>> On Jul 29, 2012, at 2:49 PM, Cyril Scetbon <cyril.scetbon@free.fr> =
wrote:
>>>>=20
>>>>> Hi,
>>>>>=20
>>>>> I'm testing AggregationClient functions to check if we could use =
coprocessors for mathematical functions.
>>>>>=20
>>>>> The code I use is the following :
>>>>>=20
>>>>> package coreprocessor;
>>>>>=20
>>>>> import org.apache.hadoop.conf.Configuration;
>>>>> import org.apache.hadoop.hbase.HBaseConfiguration;
>>>>> import org.apache.hadoop.hbase.client.Scan;
>>>>> import =
org.apache.hadoop.hbase.client.coprocessor.AggregationClient;
>>>>> import org.apache.hadoop.hbase.util.Bytes;
>>>>>=20
>>>>> public class AggregationClientTest {
>>>>>=20
>>>>> private static final byte[] TABLE_NAME =3D Bytes.toBytes("ise");
>>>>> private static final byte[] CF =3D Bytes.toBytes("core");
>>>>>=20
>>>>> public static void main(String[] args) throws Throwable {
>>>>>=20
>>>>>     Configuration configuration =3D HBaseConfiguration.create();
>>>>>=20
>>>>>     configuration.setLong("hbase.client.scanner.caching", 1000);
>>>>>     AggregationClient aggregationClient =3D new AggregationClient(
>>>>>             configuration);
>>>>>     Scan scan =3D new Scan();
>>>>>     scan.addColumn(CF, Bytes.toBytes("value"));
>>>>>     System.out.println("row count is " + =
aggregationClient.rowCount(TABLE_NAME, null, scan));
>>>>>     System.out.println("avg is " + =
aggregationClient.avg(TABLE_NAME, null, scan));
>>>>>     System.out.println("sum is " + =
aggregationClient.sum(TABLE_NAME, null, scan));
>>>>> }
>>>>> }
>>>>>=20
>>>>> The only one working is the rowCount function. For others I get a =
NPE error !
>>>>> I've checked that my table use only Long values for the column on =
which I work, and I've only one row in my table :
>>>>>=20
>>>>> ROW                                                  COLUMN+CELL
>>>>> id-cyr1                                             =
column=3Dcore:value, timestamp=3D1343596419845, =
value=3D\x00\x00\x00\x00\x00\x00\x00\x0A
>>>>>=20
>>>>> The only thing I can add is that my hbase server's version is =
0.94.0 and that I use version 0.92.0 of the hbase jar
>>>>>=20
>>>>> any idea why it doesn't work ?
>>>>>=20
>>>>> thanks
>>>>> Cyril SCETBON
>>>>>=20
>>=20


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