Distributed File System prof. Giovanni Chiola

N3FS Update


Changes to existing files are handled by keeping the old version and creating a new version.
Only after the new version is safely stored the previous one can be deleted.
Versions are characterized by an increasing version number.
Whenever possible, different versions of the same file stripes are stored in the same server.
If a newer version is stored on a different server, an appropriate consistency protocol is run in order to kill obsolete versions using the DELETE HTTP method.
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