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https://issues.apache.org/jira/browse/CASSANDRA-7887?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-7887.
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    Resolution: Duplicate

> Skip completing a streamed file if it is identical to one of local files
> ------------------------------------------------------------------------
>
>                 Key: CASSANDRA-7887
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7887
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Takenori Sato
>
> A repair could transfer files that have been done before. Under such a 
> circumstance, those files would get piled up, and a user could experience 
> critical problems such as:
> 1. overwhelming compaction load
> 2. disk full
> This leads to insufficient repairs, and data inconsistencies.
> What about skipping such a file before committing its write(calling 
> SSTableWrite.closeAndOpenReader)? For example, by comparing MD5 hash of a 
> streamed file with those of local files.



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