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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3707) Add KeyspaceChange CqlResultType
Date Thu, 21 Jun 2012 19:03:42 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13398754#comment-13398754
] 

Jonathan Ellis commented on CASSANDRA-3707:
-------------------------------------------

Quoting Rick from CASSANDRA-2478:

bq. Much of the pressure in the corporate world I live in is from teams that are trying to
use JDBC driver for C* in the same fashion and with the same BI, ETL and statistics tools
(Talend, Informatica, Datastage, SPSS, SAS) as they do for relational solutions. Many of these
tools are quite comprehensive in the information they can display and use, so they are heavy
users of the metadata features of the driver. Returning no data for some functions often causes
the tooling to just give up, not to use what they have. 

However, given that we've added this functionality to the 2478 driver, do we need to mangle
Thrift again to add it there too?  (Since clients will need to be updated to use the new information
either way...)
                
> Add KeyspaceChange CqlResultType
> --------------------------------
>
>                 Key: CASSANDRA-3707
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3707
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: API
>            Reporter: Jonathan Ellis
>            Assignee: satish babu krishnamoorthy
>              Labels: cql
>             Fix For: 1.1.2
>
>
> High level clients want to handle failover and load balancing transparently to the application,
which means not just connection pooling but moving an existing connection to another server
if necessary.  When this happens, the client needs to know what the active keyspace was before
failover, so it can set it to the same one in the new connection.
> Currently some clients handle this by checking for "SET KEYSPACE" queries, which violates
the design principle that clients shouldn't have to parse CQL.  Adding a new CqlResultType
(that is set in response to a SET KEYSPACE command) would make this unnecessary.

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