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https://issues.apache.org/jira/browse/HBASE-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12905378#action_12905378
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Andrew Purtell commented on HBASE-2001:
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We need preX hooks to make authoritative decisions, so will split them all into
preX and postX. For implementation of security policies, the preX hooks will be
most appropriate to override. For other applications it will depend if input or
output or both should be intercepted.
> 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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