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https://issues.apache.org/jira/browse/HBASE-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792665#action_12792665
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Andrew Purtell commented on HBASE-2001:
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@Todd: Just to be clear I don't disagree with you. It's a question of dividing
the problem into manageable chunks. My plan is to put ASM in the class loading
path for coprocessors from the outset. In the beginning it will serve little
purpose. I hope from there to develop CPU and memory allocation limit policy
enforcement via runtime code weaving, either myself or with assistance. I put
up HBASE-2058 to make this more clear.
> Coprocessors: Colocate arbitrary code with regions
> --------------------------------------------------
>
> Key: HBASE-2001
> URL: https://issues.apache.org/jira/browse/HBASE-2001
> Project: Hadoop HBase
> Issue Type: Sub-task
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Attachments: asm-3.2-bin.zip, asm-transformations.pdf,
> HBASE-2001.patch, org.apache.hadoop.hbase.coprocessor.Coprocessor.pdf
>
>
> "Support arbitrary 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.
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