On 12/04/2009 09:32 PM, Chris Webb wrote:
A random off-the-wall suggestion: I wonder if it would be possible to use a filesystem directory tree to store the catalogue information instead of a single large database file or the current large block file. rename(2), link(2) and even symlink(2) are atomic on all POSIX filesystems, and are presumably optimised to be reasonably fast (?). If instead of overwriting part of a large file, we wrote a new tiny file and then move() it over the top of the original tiny file, we get atomic behaviour for free pretty much everywhere.
If I understand you correctly, it make us access many tiny files when client read/write large sequential data, right? It results in a very low I/O thoughput, I think. But, using rename, link and symlink may be worth considering. Thanks for a good suggestion. Regards, MORITA Kazutaka -- sheepdog mailing list [email protected] http://lists.wpkg.org/mailman/listinfo/sheepdog
