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From "marius a. eriksen (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1016) Coprocessors
Date Sat, 08 May 2010 23:36:51 GMT


marius a. eriksen commented on CASSANDRA-1016:

hey Stu - Jeff and i got together today and reworked the patch a bit, 
including writing a trivial distributed indexer.

i think a better name for this is simply "Plugins" (and we've named
it as such in the latest patch).

the code is at:

the current toy indexer simply inverts the mutation in the same CF:

[default@foo] set cf1['row3']['col'] = 'HEYOYO'
Value inserted.
[default@foo] get cf1['HEYOYO']['index']           
=> (column=696e646578, value=row3, timestamp=0)

> Coprocessors
> ------------
>                 Key: CASSANDRA-1016
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Ryan King
>         Attachments: CASSANDRA-1016.patch
> As discussed at the Digg-hosted hackathon.
> First off, this needs a better name, the idea isn't exactly like coprocessors from BigTable
and this entry should be considered a stub for now (Stu and Marius should be able to provide
more details).
> The idea is that for mutation operations, we should all the user to run a routine that
has access to the "old" version of the data and the "new" version, and can take action.
> At a bare minimum, this should be capable of implementing distributed secondary indexes.

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