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https://issues.apache.org/jira/browse/CASSANDRA-10357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14790895#comment-14790895
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Jeremiah Jordan commented on CASSANDRA-10357:
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I was hitting this, and I can confirm that after applying this patch and
running upgradesstables I get multiple segments, and my sstable gets mmaped.
> 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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