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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3961) Make index_interval configurable per column family
Date Tue, 20 Nov 2012 21:10:58 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13501464#comment-13501464
] 

Jonathan Ellis commented on CASSANDRA-3961:
-------------------------------------------

Eyeballing this looks reasonable.  Can you rebase to trunk?
                
> Make index_interval configurable per column family
> --------------------------------------------------
>
>                 Key: CASSANDRA-3961
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3961
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>         Environment: Cassandra 1.0.7/unix
>            Reporter: Radim Kolar
>            Assignee: Radim Kolar
>             Fix For: 1.3
>
>         Attachments: cass-interval1.txt, cass-interval2.txt
>
>
> 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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