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From "Mingjie Lai (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2001) Coprocessors: Colocate user code with regions
Date Mon, 08 Nov 2010 22:46:22 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mingjie Lai updated HBASE-2001:
-------------------------------

    Attachment: packge-info.html

Modified package-info.html file. 

> 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: Mingjie Lai
>             Fix For: 0.92.0
>
>         Attachments: asm-transformations.pdf, HBASE-2001-RegionObserver-2.patch, HBASE-2001-RegionObserver.patch,
HBASE-2001.patch.gz, packge-info.html, packge-info.html, packge-info.html
>
>
> 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/mlai/hbase/tree/0.90_coprocessor

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