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https://issues.apache.org/jira/browse/CASSANDRA-10511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14978172#comment-14978172
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Benedict commented on CASSANDRA-10511:
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No, in 3.0 this is no longer a problem.
> Index summary downsampling prevents mmap access of large files after restart
> ----------------------------------------------------------------------------
>
> Key: CASSANDRA-10511
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10511
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Benedict
> Assignee: Ariel Weisberg
> Fix For: 2.1.x, 2.2.x, 3.1
>
>
> {{SSTableReader.cloneWithNewSummarySampleLevel}} constructs a
> {{SegmentedFile.Builder}} but never populates it with any boundaries. For
> files larger than 2Gb, this will result in their being accessed via buffered
> io after a restart.
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