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https://issues.apache.org/jira/browse/CASSANDRA-3930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406655#comment-13406655
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Pavel Yaskevich edited comment on CASSANDRA-3930 at 7/4/12 6:21 PM:
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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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