On Wed, Feb 06, 2008 at 05:23:54PM -0500, Tellier, Stephane wrote: > Also, I need some DSpace experts here, but if I'm not wrong, the maximum > number of subdirectories in the default assetstore could reach up to 1000000 > (100 X 100 X 100). It could be a problem if for each bitstream, DSpace have > to check where it must place it (not sure though that this can be an issue).
That should not be a problem. The internal name of a bitstream is a hash over its content. The path to the bitstream within the assetstore is formed by taking successive pairs of digits from that hash as directory names. So, once the name of a bitstream is known, the path can be calculated in negligible time. No searching is involved. The most costly thing that could happen is in the highly unlikely case of a hash collision, it could be found that a bitstream with that name (and hence that path) already exists. I don't recall what DSpace does in this case, but the Thing To Do would be to rehash with different salt and try again, until an unused name is found. That would be costly, but the hashing function should be *really* good at making the need for this unlikely. I don't have the code in front of me, but it's something like SHA-1 over the file's content concatenated with the current date/time. I wouldn't spend much time worrying about this case. -- Mark H. Wood, Lead System Programmer [EMAIL PROTECTED] Typically when a software vendor says that a product is "intuitive" he means the exact opposite.
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