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https://issues.apache.org/jira/browse/HBASE-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mingjie Lai updated HBASE-2001:
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Attachment: HBASE-2001-RegionObserver-2.patch
HBASE-2001-RegionObserver-2.patch is merged with the latest trunk (with
master-write merge: 2692). In addition, with some minor improves.
We remove map/reduce interface/job from the patch. Right now we're working
towards implementing role based access control by CP, and we only need
RegionObserver interface for it. RBAC would be the first realistic application
utilizing CP.
@Jonathan, we don't distinguish preGet() or postGet() right now. onGet() is
actually a postGet(). If there is a valid use case, we can definitely add the
hooks.
> 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-2.patch, 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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