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From: yuzhihong@gmail.com
Subject: Re: PIG with HBase Coprocessors
Date: Tue, 28 Aug 2012 19:16:14 -0700
To: "user@hbase.apache.org" <user@hbase.apache.org>
X-Virus-Checked: Checked by ClamAV on apache.org

Did you find some clue from region server logs ?

You can pastebin snippet and show the link here.=20

On Aug 28, 2012, at 6:54 PM, =C4=B3=D2=F2=E1=A6 <tewilove@gmail.com> wrote:

> Ping?
>=20
> 2012/8/28 =C4=B3=D2=F2=E1=A6 <tewilove@gmail.com>:
>> Thanks for your quick reply.
>> The co-processor looks like:
>> public void postGet(final ObserverContext<RegionCoprocessorEnvironment> e=
,
>>                        final Get get, final List<KeyValue> results)
>> {
>>    if table is X
>>    get some columns from table Y
>>    add these columns to results
>> }
>> And similar for postScannerNext().
>> This works in HBase JRuby shell using get/scan plus heavy performance los=
s.
>>=20
>> And the versions are:
>> Hadoop 1.0.3
>> HBase 0.92.1
>> Pig 0.9.2
>>=20
>>=20
>> 2012/8/27 Ted Yu <yuzhihong@gmail.com>:
>>> Allow me to refer to previous discussion:
>>> http://mail-archives.apache.org/mod_mbox/hbase-user/201203.mbox/%3CCABsY=
1jQ8+OiLh7SYkXZ8iO=3DNosY8khz7iYs+6W4u6SxCpJ5s9g@mail.gmail.com%3E
>>>=20
>>> If the above doesn't answer your question, please give us more details
>>> about the versions of HBase and PIG you're using.
>>>=20
>>> On Mon, Aug 27, 2012 at 3:42 AM, =C4=B3=D2=F2=E1=A6 <tewilove@gmail.com>=
 wrote:
>>>=20
>>>> Hi,
>>>> I've created a co-processor which will insert more columns in the
>>>> result by overriding preGet and postScannerNext.
>>>> And it is registered as a system co-processor, works with hbase shell,
>>>> both get and scan.
>>>> When I tried to access those columns in PIG, it simply returns null
>>>> for the column.
>>>> Is there something more to be done?
>>>>=20
>>>>=20
>>>> --
>>>> language: Chinese, Japanese, English
>>>>=20
>>=20
>>=20
>>=20
>> --
>> language: Chinese, Japanese, English
>=20
>=20
>=20
> --=20
> language: Chinese, Japanese, English