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From "Joshua McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6993) Windows: remove mmap'ed I/O for index files and force standard file access
Date Tue, 22 Apr 2014 16:48:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13977035#comment-13977035
] 

Joshua McKenzie commented on CASSANDRA-6993:
--------------------------------------------

Attached v2.  FBUtilities.isUnix() is really checking whether we're windows or not, but for
the purposes of the things we check for it's accurate.  Confirmed on Win8 and Win7 that this
check behaves itself (Windows 8 and Windows 7 are output respectively).

> Windows: remove mmap'ed I/O for index files and force standard file access
> --------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6993
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6993
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Joshua McKenzie
>            Assignee: Joshua McKenzie
>            Priority: Minor
>             Fix For: 3.0
>
>         Attachments: 6993_v1.txt, 6993_v2.txt
>
>
> Memory-mapped I/O on Windows causes issues with hard-links; we're unable to delete hard-links
to open files with memory-mapped segments even using nio.  We'll need to push for close to
performance parity between mmap'ed I/O and buffered going forward as the buffered / compressed
path offers other benefits.



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