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https://issues.apache.org/jira/browse/CASSANDRA-21825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18136266#comment-18136266
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Francisco Guerrero commented on CASSANDRA-21825:
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+1 

> CEP-45: Tracked full and preview repair includes merkle trees from witness 
> replicas
> -----------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-21825
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-21825
>             Project: Apache Cassandra
>          Issue Type: Bug
>          Components: Consistency/Coordination
>            Reporter: Blake Eggleston
>            Assignee: Blake Eggleston
>            Priority: Normal
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Since witness replicas only have a temporary dataset in the log, calculating 
> a merkle tree from their non-existent dataset will always result in a preview 
> repair mismatch, or a full stream of data in a full repair. Additionally, 
> witnesses need to be synced before a full repair



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