Return-Path: 
 <user-return-26525-apmail-hbase-user-archive=hbase.apache.org@hbase.apache.org>
X-Original-To: apmail-hbase-user-archive@www.apache.org
Delivered-To: apmail-hbase-user-archive@www.apache.org
Received: from mail.apache.org (hermes.apache.org [140.211.11.3])
	by minotaur.apache.org (Postfix) with SMTP id 9A0FD9E1A
	for <apmail-hbase-user-archive@www.apache.org>;
 Tue, 10 Apr 2012 16:20:56 +0000 (UTC)
Received: (qmail 71755 invoked by uid 500); 10 Apr 2012 16:20:54 -0000
Delivered-To: apmail-hbase-user-archive@hbase.apache.org
Received: (qmail 71717 invoked by uid 500); 10 Apr 2012 16:20:54 -0000
Mailing-List: contact user-help@hbase.apache.org; run by ezmlm
Precedence: bulk
List-Help: <mailto:user-help@hbase.apache.org>
List-Unsubscribe: <mailto:user-unsubscribe@hbase.apache.org>
List-Post: <mailto:user@hbase.apache.org>
List-Id: <user.hbase.apache.org>
Reply-To: user@hbase.apache.org
Delivered-To: mailing list user@hbase.apache.org
Received: (qmail 71709 invoked by uid 99); 10 Apr 2012 16:20:54 -0000
Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230)
    by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 10 Apr 2012 16:20:54 +0000
X-ASF-Spam-Status: No, hits=-0.5 required=5.0
	tests=FREEMAIL_ENVFROM_END_DIGIT,RCVD_IN_DNSWL_LOW,SPF_PASS
X-Spam-Check-By: apache.org
Received-SPF: pass (nike.apache.org: domain of yongyong313@gmail.com
 designates 209.85.210.53 as permitted sender)
Received: from [209.85.210.53] (HELO mail-pz0-f53.google.com) (209.85.210.53)
    by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 10 Apr 2012 16:20:47 +0000
Received: by dajr28 with SMTP id r28so6635815daj.12
        for <user@hbase.apache.org>; Tue, 10 Apr 2012 09:20:26 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :content-type:content-transfer-encoding;
        bh=WMWZnGDh/cW9F/rMTcR/aAMjvyM6omT4lrlt2kGKAuo=;
        b=WFpp3yy+dgGe/9RpPDcv6Pn50430np4WpDPO7/2Ip6KIXxsDJtXa2HG6wgvAW30CWL
         gI8qMjqNJx30XDh22qRsUkWXLElrfeG4kaPGeRs1Vj4Shr58aSQf7HaTB0yYFa+1JpqM
         C7IAu3l6HXEpd8brS6KnMQW+7JSQnu/KbNLtvDDh+XEpL7+yAw/2lqMQUTqsVkj+LdC9
         NNk4rJOjOTlsCt+CvtFdXm0jpznZvQ9l8uXwgrr5hF+FXVSez88WioG0b86labtBkUAm
         KJOAPEarRYldczttKgWqYDuaaCVAIB0ghwn+q6TkGqbswrSKQOxWbwD9LEkmFO94Q9RI
         3GOw==
MIME-Version: 1.0
Received: by 10.68.225.104 with SMTP id rj8mr30098084pbc.135.1334074825945;
 Tue, 10 Apr 2012 09:20:25 -0700 (PDT)
Received: by 10.68.20.42 with HTTP; Tue, 10 Apr 2012 09:20:25 -0700 (PDT)
In-Reply-To: 
 <CADfYSXQMj9h47MqTqUTYsFbyqPBKYWONBHFE2skHkaE1pPGvYg@mail.gmail.com>
References: 
 <CABALG=RgGvYTUhybQmVi9fevWt2+NWw5DT5Y9A-8Y4-85_PXDA@mail.gmail.com>
	<CADfYSXQMj9h47MqTqUTYsFbyqPBKYWONBHFE2skHkaE1pPGvYg@mail.gmail.com>
Date: Tue, 10 Apr 2012 18:20:25 +0200
Message-ID: 
 <CABALG=SZTCx_7Z-2DuCq-7xwuX2U8mAj6NnHTrSR=Hjo3YBLcA@mail.gmail.com>
Subject: Re: A confusion of RegionCoprocessorEnvironment.getReion() method
From: yonghu <yongyong313@gmail.com>
To: user@hbase.apache.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Thanks for your explanation. Now it's clear for me.

Regards!

Yong

On Tue, Apr 10, 2012 at 6:13 PM, Gary Helmling <ghelmling@gmail.com> wrote:
> Each and every HRegion on a given region server will have it's own
> distinct instance of your configured RegionObserver class.
> RegionCoprocessorEnvironment.getRegion() returns a reference to the
> HRegion containing the current coprocessor instance.
>
> The hierarchy is essentially:
>
> HRegionServer
> \_ =A0HRegion
> =A0 =A0 =A0 =A0\_ RegionCoprocessorHost
> =A0 =A0 =A0 =A0 =A0 =A0 \_ =A0<your RegionObserver instance>
>
> (repeated for each HRegion).
>
> This blog post by Mingjie may help explain things a bit more:
> https://blogs.apache.org/hbase/entry/coprocessor_introduction
>
>
> --gh
>
>
>
> On Tue, Apr 10, 2012 at 2:30 AM, yonghu <yongyong313@gmail.com> wrote:
>> Hello,
>>
>> The description of this method is " /** @return the region associated
>> with this coprocessor */" and the return value is an HRegion instance.
>> If I configure the region-coprocessor class in hbase-site.xml. =A0It
>> means that this coprocessor will be applied to every HRegion which
>> resides on this Region Server (if I understand right). =A0Why this
>> method only return one HRgion instance not a list of HRgion
>> instances?Suppose that a region server has two HRegions, one is for
>> table 'test1', the other is for table 'test2'. =A0Which HRgion instance
>> will be returned if I call RegionCoprocessorEnvironment.getReion()?
>>
>> Thanks!
>>
>> Yong