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https://issues.apache.org/jira/browse/CASSANDRA-10357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14790920#comment-14790920
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Benedict commented on CASSANDRA-10357:
--------------------------------------

bq.  I guess anyone who has compression turned off potentially needs to run 
upgradesstables :/

We could instead automatically detect this and fix it on opening the files.

> mmap file boundary selection is broken for some large files 
> ------------------------------------------------------------
>
>                 Key: CASSANDRA-10357
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10357
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Benedict
>            Assignee: Benedict
>             Fix For: 2.1.10
>
>
> If an early open interval occurs to close to an mmap boundary, the boundary 
> can be lost. Patch available 
> [here|https://github.com/belliottsmith/cassandra/tree/mmap-boundaries].



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