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https://issues.apache.org/jira/browse/CASSANDRA-1472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045042#comment-13045042
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Stu Hood edited comment on CASSANDRA-1472 at 6/6/11 7:45 PM:
-------------------------------------------------------------
By returning the row as a probable match, and resolving using the base data
(the brute force filtering): this is why -it- reads are less performant for
high update ratios.
With the timestamp work from CASSANDRA-2498, we'd be able to push slightly more
down to this index (especially if we added timestamps to it). If we matched a
particular sstable with the index, and the match has a higher timestamp than
any other file, then we can return immediately with 2498.
was (Author: stuhood):
By returning the row as a probable match, and resolving using the base data
(the brute force filtering): this is why it is less performant for high update
ratios.
With the timestamp work from CASSANDRA-2498, we'd be able to push slightly more
down to this index (especially if we added timestamps to it). If we matched a
particular sstable with the index, and the match has a higher timestamp than
any other file, then we can return immediately with 2498.
> Add bitmap secondary indexes
> ----------------------------
>
> Key: CASSANDRA-1472
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1472
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Stu Hood
> Assignee: Stu Hood
> Fix For: 1.0
>
> Attachments: 0.7-1472-v5.tgz, 0.7-1472-v6.tgz,
> 0001-CASSANDRA-1472-rebased-to-0.7-branch.txt,
> 0019-Rename-bugfixes-and-fileclose.txt, 1472-v3.tgz, 1472-v4.tgz,
> 1472-v5.tgz, anatomy.png, v4-bench-c32.txt
>
>
> Bitmap indexes are a very efficient structure for dealing with immutable
> data. We can take advantage of the fact that SSTables are immutable by
> attaching them directly to SSTables as a new component (supported by
> CASSANDRA-1471).
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