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Message-ID: <30991089.152941275545289970.JavaMail.jira@thor>
Date: Thu, 3 Jun 2010 02:08:09 -0400 (EDT)
From: "HBase Review Board (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Subject: [jira] Commented: (HBASE-2001) Coprocessors: Colocate user code
 with regions
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    [ https://issues.apache.org/jira/browse/HBASE-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874971#action_12874971 ] 

HBase Review Board commented on HBASE-2001:
-------------------------------------------

Message from: stack@duboce.net


bq.  On 2010-06-02 17:24:34, Todd Lipcon wrote:
bq.  > this seems like a reasonable framework, but I'd rather see this stay around as a branch until there is at least one or two actual things using it for a real purpose. Otherwise I think we'll end up shipping an API that we later realize doesn't work for real apps. What do you think?

This seems like a good idea when dev'ing an Interface.  After the 3rd implemenation you'll have some confidence in your Interface.


- stack


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> Coprocessors: Colocate user code with regions
> ---------------------------------------------
>
>                 Key: HBASE-2001
>                 URL: https://issues.apache.org/jira/browse/HBASE-2001
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>         Attachments: asm-3.2-bin.zip, asm-transformations.pdf, HBASE-2001-RegionObserver.patch, HBASE-2001.patch.gz
>
>
> Support user code that runs run next to each region in table. As regions split and move, coprocessor code should automatically  move also.
> Use classloader which looks on HDFS.
> Associate a list of classes to load with each table. Put this in HRI so it inherits from table but can be changed on a per region basis (so then those region specific changes can inherited by daughters). 
> Not completely arbitrary code, should require implementation of an interface with callbacks for:
> * Open
> * Close
> * Split
> * Compact
> * (Multi)get and scanner next()
> * (Multi)put
> * (Multi)delete
> Add method to HRegionInterface for invoking coprocessor methods and retrieving results.  
> Add methods in o.a.h.h.regionserver or subpackage which implement convenience functions for coprocessor methods and consistent/controlled access to internals: store access, threading, persistent and ephemeral state, scratch storage, etc. 
> GitHub: http://github.com/apurtell/hbase-coprocessor

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