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From "Joshua McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8005) Server-side DESCRIBE
Date Tue, 30 Sep 2014 20:36:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14153719#comment-14153719
] 

Joshua McKenzie commented on CASSANDRA-8005:
--------------------------------------------

+1 for separating the implementation details of our schema tables from the drivers' scope.
 I'd much rather we be able to make changes and have that not push pressure down to drivers
to make changes to stay in sync, nevermind the efficiencies gained by implementing that logic
in one place rather than forcing re-implementation.

> Server-side DESCRIBE
> --------------------
>
>                 Key: CASSANDRA-8005
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8005
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API
>            Reporter: Tyler Hobbs
>            Priority: Minor
>              Labels: cql3
>             Fix For: 3.0
>
>
> The various {{DESCRIBE}} commands are currently implemented by cqlsh, and nearly identical
implementations exist in many drivers.  There are several motivations for making {{DESCRIBE}}
part of the CQL language:
> * Eliminate the (fairly complex) duplicate implementations across drivers and cqlsh
> * Get closer to allowing drivers to not have to fetch the schema tables. (Minor changes
to prepared statements are also needed.)
> * Have instantaneous support for new schema features in cqlsh.  (You currently have to
update the bundled python driver.)
> * Support writing out schemas where it makes sense.  One good example of this is backups.
 You need to restore the schema before restoring data in the case of total loss, so it makes
sense to write out the schema alongside snapshots.



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