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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2012/12/05 05:26:58 UTC

[jira] [Commented] (CASSANDRA-5029) Add back bloom filter to LCS

    [ https://issues.apache.org/jira/browse/CASSANDRA-5029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510261#comment-13510261 ] 

Jonathan Ellis commented on CASSANDRA-5029:
-------------------------------------------

Patch makes LCS default to 0.1 FP, which is half the size (5 buckets vs 10 per row) of the default 0.01 for STCS.
                
> Add back bloom filter to LCS
> ----------------------------
>
>                 Key: CASSANDRA-5029
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5029
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>         Attachments: 5029.txt
>
>
> Even with LCS you're going to frequently have 6 or 7 levels, with data in only one or two of those.  With randomly distributed writes you'll have overlapping sstables in the other levels so having a bloom filter will be good to avoid hitting disk.

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