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https://issues.apache.org/jira/browse/CASSANDRA-1717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13079293#comment-13079293
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Pavel Yaskevich commented on CASSANDRA-1717:
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After thinking about this for a while I think we should do checksum at the
column level only which will give us better control over individual columns and
does not seem to be a big overhead (instead of doing it at the column index
level and relaying on digest). Checksum on the compressed block level is
unnecessary because bitrot, for example, will be detected right on
decompression or column deserialization time. Thoughts?
> Cassandra cannot detect corrupt-but-readable column data
> --------------------------------------------------------
>
> Key: CASSANDRA-1717
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1717
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Pavel Yaskevich
> Fix For: 1.0
>
> Attachments: checksums.txt
>
>
> Most corruptions of on-disk data due to bitrot render the column (or row)
> unreadable, so the data can be replaced by read repair or anti-entropy. But
> if the corruption keeps column data readable we do not detect it, and if it
> corrupts to a higher timestamp value can even resist being overwritten by
> newer values.
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