Jason,

Although messages are always written to the log segment file, they
initially are only in the file system's pagecache. As Swapnil mentioned
earlier, messages are flushed to disk periodically. If you do a clean
shutdown (kill -15), we close all log file, which should flush all dirty
data to disk. If you do a hard kill or your machine just crashed, the
unflushed data may be lost. The data that you saw in the .log file can be
just in the pagecache.

Thanks,

Jun

On Tue, Feb 19, 2013 at 4:05 AM, Jason Huang <[EMAIL PROTECTED]> wrote:
 
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