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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10511) Index summary downsampling prevents mmap access of large files after restart
Date Wed, 28 Oct 2015 10:33:27 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14978172#comment-14978172
] 

Benedict commented on CASSANDRA-10511:
--------------------------------------

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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