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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4736) Cassandra should expose a native existence check API
Date Sat, 21 Sep 2013 02:30:51 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13773691#comment-13773691
] 

Jonathan Ellis commented on CASSANDRA-4736:
-------------------------------------------

My point is that the performance difference between {{SELECT foo}} and {{SELECT exists(foo)}}
is small, unless foo is a blob.
                
> Cassandra should expose a native existence check API
> ----------------------------------------------------
>
>                 Key: CASSANDRA-4736
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4736
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: sankalp kohli
>            Priority: Minor
>              Labels: features
>
> Currently Cassandra does not have an existence check API. Because of this, data needs
to be read and thats how you know whether data is present or not. 
> This is not optimal because one replica needs to provide data. Instead a new API could
be exposed where each replica only sends out hash of the data. Repairs and other stuff can
happen like a normal read call. 

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