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https://issues.apache.org/jira/browse/CASSANDRA-3930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406627#comment-13406627
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Pavel Yaskevich commented on CASSANDRA-3930:
--------------------------------------------
It's not that simple :) I see that at least to methods require buffer seeking
in CommitLongSegment: recycle() and write(RowMutation) - the second uses
buffer.position for housekeeping at the end of the method plus there is file
pre-allocation which couldn't be done by means of SW. I guess RAF + mmap there
is the most flexible solution here.
> 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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