Persistent data » History » Revision 8
Revision 7 (Greg Burri, 08/26/2009 04:20 PM) → Revision 8/18 (Greg Burri, 09/02/2009 09:21 PM)
h1. Structures h2. Files cache This file contains all the shared files and theirs SHA-1 hashes. This file is saved in user space after an update of the file list, it is completely loaded at the start of Aybabtu. If some paths of some files doesn't match the shared directory they are discarded. You can see the proto file here : source:/application/Protos/files_cache.proto h3. Size Here is a size approximation for 50'000 files stored in 1 TB. The overhead of the file format is not taken in account. <pre> Nb of files : 50'0000 Total size : 1 TB Chunk Size : 32 MB Average file per directory : 50 Average filename and dirname length : 50 char Size of a hash : 20B </pre> <pre> AverageFileSize = 1*1024^4 / 50'000 = 21MB Sha1Size = floor(AverageFileSize / 32MB) * 20 * 50'000 = 1 * 20 * 50'000 = 977kB FilenameSize = 50'000 * 50 * 2 = 4.8MB (2 bytes per char) DirnameSize = (50'000 / 50) * 50 * 2 = 97kB TotalSize = 977kB + 4.8MB + 97kB = 5.9MB </pre> h2. Queued files and directories A file containing the queued files and directories is saved in user space. An item from the list may contains a remote peer id and/or the hashes. For more details see the file : source:/application/Protos/queue.proto TODO.. h2. Configuration file TODO..