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https://issues.apache.org/jira/browse/CASSANDRA-13226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15887654#comment-15887654
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Benjamin Roth commented on CASSANDRA-13226:
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Isn't this also true for non-incremental repairs?
Merkle tree calculation also triggers a flush and any repair begins with a 
merkle tree. So there is no need to flush as the inconsistent dataset to be 
streamed for repair is always contained in SSTables flushed by MT calculation 
before.

> StreamPlan for incremental repairs flushing memtables unnecessarily
> -------------------------------------------------------------------
>
>                 Key: CASSANDRA-13226
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13226
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Blake Eggleston
>            Assignee: Blake Eggleston
>            Priority: Minor
>             Fix For: 4.0
>
>
> Since incremental repairs are run against a fixed dataset, there's no need to 
> flush memtables when streaming for them.



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