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From "Jiri Eichler (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3961) Make index_interval configurable per column family
Date Fri, 23 Mar 2012 14:29:28 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13236627#comment-13236627
] 

Jiri Eichler commented on CASSANDRA-3961:
-----------------------------------------

If there are column families of very different sizes, such option will save a lot of memory
and since it's not any technical limitation of the Cassandra's design, this option should
be available.
                
> Make index_interval configurable per column family
> --------------------------------------------------
>
>                 Key: CASSANDRA-3961
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3961
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 1.0.7
>         Environment: Cassandra 1.0.7/unix
>            Reporter: Radim Kolar
>            Priority: Minor
>
> After various experiments with mixing OLTP a OLAP workload running on single cassandra
cluster i discovered that lot of memory is wasted on holding index samples for CF which are
rarely accessed or index is not much used for CF access because slices over keys are used.

> There is per column family setting for configuring bloom filters - bloom_filter_fp_chance.
Please add setting index_interval configurable per CF as well. If this setting is not set
or it is zero, default from cassandra.yaml will be used.

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