cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-4885) Remove or rework per-row bloom filters
Date Fri, 30 Nov 2012 19:19:58 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13507573#comment-13507573
] 

Jonathan Ellis edited comment on CASSANDRA-4885 at 11/30/12 7:19 PM:
---------------------------------------------------------------------

We could use our knowledge of the cql3 schema to only generate BF for wide rows...

But I still think it should default to off, cql3 wide rows are almost always used to support
denormalized, clustered resultsets, which are still going to correspond to slices.
                
      was (Author: jbellis):
    We coulde use our knowledge of the cql3 schema to only generate BF for wide rows...

But I still think it should default to off, cql3 wide rows are almost always used to support
denormalized, clustered resultsets, which are still going to correspond to slices.
                  
> 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: 1.3
>
>         Attachments: 0001-CASSANRDA-4885-Remove-per-row-bloom-filter.patch, 0002-CASSANRDA-4885-update-test.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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message