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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4885) Remove or rework per-row bloom filters
Date Mon, 18 Mar 2013 12:56:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13605077#comment-13605077
] 

Jason Brown commented on CASSANDRA-4885:
----------------------------------------

After writing the code that allows the option, and now thinking on it for a while, I agree
with Jonathan about removing the row-level BFs and the ability to tweak it. I'm not fully
convinced that having another knob to play with will, in the end, help users to elicit more
performance. I'm afraid it might cause confusion (yet another know) or they'll spin their
wheels trying to use it.
                
> Remove or rework per-row bloom filters
> --------------------------------------
>
>                 Key: CASSANDRA-4885
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4885
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Jason Brown
>             Fix For: 2.0
>
>         Attachments: 0001-CASSANRDA-4885-Remove-per-row-bloom-filter.patch, 0002-CASSANRDA-4885-update-test.patch,
4885-v1.patch
>
>
> Per-row bloom filters may be a misfeature.
> On small rows we don't create them.
> On large rows we essentially only do slice queries that can't take advantage of it.
> And on very large rows if we ever did deserialize it, the performance hit of doing so
would outweigh the benefit of skipping the actual read.

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