Hi folk, I studing wikimedia system and there is something I want to know about images: Is it possible to upload (and so on store) the images in different folders? I realised that when you do a normal upload, files are stored in folders with *arbitrary?* name like: "A", "01", etc. Does anybody know what programming mechanism is used to allow this? Could it be used to upload files to different folders? Thanks.
On 11-04-18 09:23 AM, Juan Rodríguez wrote:
Hi folk, I studing wikimedia system and there is something I want to know about images: Is it possible to upload (and so on store) the images in different folders? I realised that when you do a normal upload, files are stored in folders with *arbitrary?* name like: "A", "01", etc. Does anybody know what programming mechanism is used to allow this? Could it be used to upload files to different folders? Thanks.
That's the $wgHashedUploadDirectory setting (on by default) which is used to avoid having too many files in one folder because some filesystems don't perform well with large numbers of files in one folder.
The algorithm for that is based on a md5 of the name, the first hex character is used for the first directory, then the first two characters are used for the subdirectory. Foo.png -> md5 = f865cbca12286c1c5b7616b4a70fbf68 -> f + f8 = /f/f8/Foo.png
~Daniel Friesen (Dantman, Nadir-Seen-Fire) [http://daniel.friesen.name]
Is this a problem anymore with Ext3 using dir_index? Or is this a different kind of performance issue?
On Mon, Apr 18, 2011 at 9:37 AM, Daniel Friesen lists@nadir-seen-fire.comwrote:
On 11-04-18 09:23 AM, Juan Rodríguez wrote:
Hi folk, I studing wikimedia system and there is something I want to know about images: Is it possible to upload (and so on store) the images in different
folders?
I realised that when you do a normal upload, files are stored in folders with *arbitrary?* name like: "A", "01", etc. Does anybody know what programming mechanism is used to allow this? Could it be used to upload files to different folders? Thanks.
That's the $wgHashedUploadDirectory setting (on by default) which is used to avoid having too many files in one folder because some filesystems don't perform well with large numbers of files in one folder.
The algorithm for that is based on a md5 of the name, the first hex character is used for the first directory, then the first two characters are used for the subdirectory. Foo.png -> md5 = f865cbca12286c1c5b7616b4a70fbf68 -> f + f8 = /f/f8/Foo.png
~Daniel Friesen (Dantman, Nadir-Seen-Fire) [http://daniel.friesen.name]
MediaWiki-l mailing list MediaWiki-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
Probably it is not strictly needed anymore in modern formats like ext3, ext4, xfs, ... but it is still recommended.
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