CommitLogSegment uses RandomAccessFile which doesnt have fadvice
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                 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: 1.1.1, 1.2


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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