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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2001) Coprocessors: Colocate arbitrary code with regions
Date Fri, 18 Dec 2009 21:30:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792652#action_12792652
] 

Andrew Purtell commented on HBASE-2001:
---------------------------------------

Nobody has to develop and deploy custom coprocessors if they don't want the risk.

Maybe it's not highlighted enough but my current thinking and plan is to use ASM to also impose
some constraints. This is middle ground between arbitrary function and a locked down language
and will take only reasonable effort to achieve (with part time one person contribution).

Beyond that, I'm not opposed if someone wants to contribute a restricted yet somehow useful
little language, I just have no plans to do that or I'll be working on this indefinitely.




> 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, 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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