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From "Pavel Yaskevich (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-3930) CommitLogSegment uses RandomAccessFile which doesnt have fadvice
Date Wed, 04 Jul 2012 18:23:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406655#comment-13406655
] 

Pavel Yaskevich edited comment on CASSANDRA-3930 at 7/4/12 6:21 PM:
--------------------------------------------------------------------

How do you mean active? mmap uses the same page cache as normal access does so the same page
out applies, I don't see how we dould be able to avoid using buffer for CLS if we to use SW.

Edit: forgot to mention, we should probably look into "madvice" direction if yoi want to control
over CLS mappings, instead of trying to use SW
                
      was (Author: xedin):
    How do you mean active? mmap uses the same page cache as normal access does so the same
page out applies, I don't see how we dould be able to avoid using buffer for CLS if we to
use SW.
                  
> CommitLogSegment uses RandomAccessFile which doesnt have fadvice
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-3930
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3930
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 1.0.7
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 1.1.3
>
>
> Wondering if we even need MMap file in this case as it is always sequential.
> If yes, we need it we might want to replace 
> logFileAccessor = new RandomAccessFile(logFile, "rw");
> to
> logFileAccessor = SequentialWriter.open(logFile, true);
> in CommitLogSegment

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