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https://issues.apache.org/jira/browse/CASSANDRA-1472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003059#comment-13003059
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Stu Hood commented on CASSANDRA-1472:
-------------------------------------

Both the buckets and the OrBiC projection need compression. Checksumming is 
arguably not necessary for this ticket, but will be for 674, so a design that 
doesn't allow for it will give us a serious headache.

> 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: 0.7.4
>
>         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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