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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
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HBase Review Board commented on HBASE-2001:
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Message from: [email protected]
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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