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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2001) Coprocessors: Colocate arbitrary code with regions
Date Thu, 03 Dec 2009 20:39:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12785506#action_12785506
] 

stack commented on HBASE-2001:
------------------------------

Are you using HTableInterface for your "table" implementations?

+1 that coprocessors be used to implement filters.  Would we keep the filter interface as
is?   With coprocessors, filters would be able to have state that crossed rows and even regions?
 (Currently state is in-row only).

Critical I'd say is that coprocessors are testable without having to spin up servers.  They
should be testable standalone if possible.

> 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.HCoprocessor.java,
org.apache.hadoop.hbase.HCoprocessor.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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