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https://issues.apache.org/jira/browse/CASSANDRA-10511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14979096#comment-14979096
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Ariel Weisberg commented on CASSANDRA-10511:
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Do we need to also fix this for files that have broken summaries already? I am
going to check, but I think that you don't any portion of the file mapped if
the bounds aren't set correctly.
|[2.2
code|https://github.com/apache/cassandra/compare/apache:cassandra-2.2...aweisberg:CASSANDRA-10511-2.2?expand=1]|[utests|http://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-10511-2.2-testall/]|[dtests|http://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-10511-2.2-dtest/]|
|[2.1
code|https://github.com/apache/cassandra/compare/apache:cassandra-2.1...aweisberg:CASSANDRA-10511-2.1?expand=1]|[utests|http://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-10511-2.1-testall/]|[dtests|http://cassci.datastax.com/view/Dev/view/aweisberg/job/aweisberg-CASSANDRA-10511-2.1-dtest/]|
> 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
> 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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