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https://issues.apache.org/jira/browse/HBASE-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924653#action_12924653
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HBase Review Board commented on HBASE-2001:
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Message from: "Andrew Purtell" <apurt...@apache.org>
bq. On 2010-10-25 06:49:15, Himanshu Vashishtha wrote:
bq. > src/main/java/org/apache/hadoop/hbase/regionserver/CoprocessorHost.java,
line 343
bq. > <http://review.cloudera.org/r/876/diff/7/?file=14190#file14190line343>
bq. >
bq. > What is its purpose here? I couldn't see it being used as of now. Is
it for some future functionality.
The access controller coprocessor (HBASE-3025) needs a CatalogTracker. Other
future functionality is also considered.
- Andrew
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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: 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
>
>
> 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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