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

["Joshua McKenzie (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-6993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13971959#comment-13971959 ] 

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

Hard-coded in DatabaseDescriptor to use Config.DiskAccessMode.standard for both file and index access if it's not a unix environment.

I also took the liberty of changing the isUnix check to strcmp once on class init and then reference a set boolean later rather than checking the string every time we called the function.

> 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
>
>
> 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.



--
This message was sent by Atlassian JIRA
(v6.2#6252)