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From "Benjamin Lerer (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-6328) Allow deleting records with a secondary index lookup
Date Wed, 20 May 2015 08:13:03 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-6328?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benjamin Lerer resolved CASSANDRA-6328.
---------------------------------------
    Resolution: Won't Fix

> Allow deleting records with a secondary index lookup
> ----------------------------------------------------
>
>                 Key: CASSANDRA-6328
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6328
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: David Huang
>            Priority: Minor
>             Fix For: 3.x
>
>
> Currently, clients must query for row keys from a specific secondary index and delete
the results. This incurs network traffic whereas a single server operation would be enough.
> ==== Example ====
> In C* we would have to query for all playlist_id for user "JohnSmith" and issue deletes
for each key. Deleting by secondary index would allow the entire operation to occur within
C* without the client needing to issue multiple statements.
> Delete By Secondary Index
> CREATE TABLE playlist (
> playlist_id text,
> user_id text,
> song_name set<text>,
> PRIMARY_KEY (playlist_id)
> );
> CREATE INDEX on playlist (user_id);
> DELETE FROM playlist WHERE user_id = "JohnSmith";
> Delete By Client
> // Schema
> CREATE TABLE playlist (
> playlist_id text,
> user_id text,
> song_name set<text>,
> PRIMARY_KEY (playlist_id)
> );
> CREATE INDEX on playlist (user_id);
> // Client
> ResultSet resultSet = session.execute("select playlist_id from playlist where userid
= "JohnSmith"");
> PreparedStatement delete = session.prepare("DELETE FROM playlist WHERE playlist_id =
 ?");
> for(Row row : resultSet){
> session.execute(delete.bind(row.getString("playlist_id")));
> }
>   



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