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Posted to commits@cassandra.apache.org by "Joshua McKenzie (JIRA)" <ji...@apache.org> on 2015/12/08 17:32:11 UTC

[jira] [Updated] (CASSANDRA-6993) Windows: remove mmap'ed I/O for index files and force standard file access

     [ https://issues.apache.org/jira/browse/CASSANDRA-6993?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joshua McKenzie updated CASSANDRA-6993:
---------------------------------------
    Component/s: Local Write-Read Paths

> 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
>          Components: Local Write-Read Paths
>            Reporter: Joshua McKenzie
>            Assignee: Joshua McKenzie
>            Priority: Minor
>              Labels: Windows
>             Fix For: 2.1.3, 2.2.0 beta 1
>
>         Attachments: 6993_2.1_v1.txt, 6993_v1.txt, 6993_v2.txt, 6993_v3.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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