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From "Aaron Ploetz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6559) cqlsh should warn about ALLOW FILTERING
Date Mon, 29 Dec 2014 20:51:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260432#comment-14260432
] 

Aaron Ploetz commented on CASSANDRA-6559:
-----------------------------------------

"Maybe only require that on the first ALLOW FILTERING per cqlsh session"

It's a tough argument either way.  We don't want to make Cassandra difficult or inconvenient
to use, yet the use of ALLOW FILTERING isn't exactly something we want to encourage.  The
correct path is for users to build their queries and column families the right way, and therefore
not need ALLOW FILTERING at all.  Will pestering them with "are you sure" type questions on
each query encourage proper modeling by itself?  Probably not.

So while I don't think that making ALLOW FILTERING easy to use is in our best interests, I
will agree that going with a warning on the first query is probably the best option.  And
with the way I have the patch written, requiring a 'Y' only once per session isn't hard to
do.

I also like the further definition of the warning message.  I'll add that in.

> cqlsh should warn about ALLOW FILTERING
> ---------------------------------------
>
>                 Key: CASSANDRA-6559
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6559
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>            Reporter: Tupshin Harper
>            Priority: Minor
>              Labels: cqlsh
>             Fix For: 2.0.12
>
>
> ALLOW FILTERING can be a convenience for preliminary exploration of your data, and can
be useful for batch jobs, but it is such an anti-pattern for regular production queries, that
cqlsh should provie an explicit warn ingwhenever such a query is performed.



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