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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2000) Coprocessors
Date Sun, 22 Nov 2009 04:50:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12781092#action_12781092
] 

stack commented on HBASE-2000:
------------------------------

Thats a sweet citation Andrew.  Has update on BT.  Has stuff on (a few things on) how they
do replication.

> Coprocessors
> ------------
>
>                 Key: HBASE-2000
>                 URL: https://issues.apache.org/jira/browse/HBASE-2000
>             Project: Hadoop HBase
>          Issue Type: New Feature
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>
> From Google's Jeff Dean, in a keynote to LADIS 2009 (http://www.scribd.com/doc/21631448/Dean-Keynote-Ladis2009,
slides 66 - 67): 
> BigTable Coprocessors (New Since OSDI'06)
> * Arbitrary code that runs run next to each tablet in table
>     ** As tablets split and move, coprocessor code automatically splits/moves too
> * High-level call interface for clients
>     ** Unlike RPC, calls addressed to rows or ranges of rows
> * coprocessor client library resolves to actual locations
>     ** Calls across multiple rows automatically split into multiple parallelized RPCs
> * Very flexible model for building distributed services
>     ** Automatic scaling, load balancing, request routing for apps
> Example Coprocessor Uses
> * Scalable metadata management for Colossus (next gen GFS-like file system)
> * Distributed language model serving for machine translation system
> * Distributed query processing for full-text indexing support
> * Regular expression search support for code repository

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