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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2001) Coprocessors: Colocate user code with regions
Date Thu, 27 May 2010 04:59:38 GMT

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

Andrew Purtell updated HBASE-2001:
----------------------------------

    Attachment: HBASE-2001-RegionObserver.patch

HBASE-2001-RegionObserver.patch is just the parts of the 2001 patch for the RegionObserver
interface, which enables extension of the regionserver through stacking dynamically loaded
extensions on upcalls from HRegion. Made some improvements over the other patch. Added a test
case. 

> 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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