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https://issues.apache.org/jira/browse/CASSANDRA-18398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17717053#comment-17717053
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Branimir Lambov commented on CASSANDRA-18398:
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We have not. OTOH the risk is different – provided bit rot in just one place, 
the result is that we may miss data (as exact key checks will fail) rather than 
corrupt it, which replication should properly deal with. It is very difficult 
to imagine a corruption of both the partition and row index in a way that 
successfully leads to the wrong key being accepted.

Another thing this initial version does not support is index encryption.

> CEP-25: Trie-indexed SSTable format
> -----------------------------------
>
>                 Key: CASSANDRA-18398
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-18398
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local/SSTable
>            Reporter: Branimir Lambov
>            Assignee: Branimir Lambov
>            Priority: Normal
>             Fix For: 5.x
>
>          Time Spent: 16.5h
>  Remaining Estimate: 0h
>
> Implementation of Big Trie-Indexed (BTI) SSTable format, per 
> [CEP-25|https://cwiki.apache.org/confluence/display/CASSANDRA/CEP-25%3A+Trie-indexed+SSTable+format].



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