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https://issues.apache.org/jira/browse/CASSANDRA-3648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13205238#comment-13205238
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Jonathan Ellis commented on CASSANDRA-3648:
-------------------------------------------

I guess we'd need to add the inverse of the checksumming done in 
SequentialWriter, to RandomAccessReader or a SequentialReader class, to do this 
efficiently.  Sounds messy...
                
> Repair should validate checksums before streaming
> -------------------------------------------------
>
>                 Key: CASSANDRA-3648
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3648
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jonathan Ellis
>            Priority: Minor
>             Fix For: 1.2
>
>
> We have block checksums and sha1 full-file hashes, but currently we do not 
> validate these before streaming in a repair.

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