are all operations lock free?

[kapitainsky]

Maybe trivial question but I could not find clarification anywhere...

The story of two laptops backing up to the same cloud remote. I know that there is no issue with running concurrent backups - this is how it works for me for long. The same with one laptop backing up and other running prune.

But what about other operations? Can I run two rustic prune? (of course without --instant-delete flag) at the same time?. And what about rustic check?

In general are all operations lock free and multiple can be run at the same time or there are some exceptions (like --instant-delete for prune).

[aawsome]

Hi @kapitainsky
Yes, all operations are designed lock-free. This means all commands can run parallel. This is especially true for multiple backup runs and backup runs parallel to prune.
However, make sure that each individual backup run won't take longer as the --keep-delete option (default: 23h) if you run prune parallel to backup - and that you don't use --instant-delete.

Of course, any read-only command also safely runs parallel to any other command.

Multiple parallel forget or prune runs are designed to work, too. But I have to admit that we have not tested this in detail so far. Because of this and other reasons (like ACLs to set up and scheduling) I would recommend to schedule forget and prune for the whole repository using a single host to do so. However feedback on this with multiple parallel runs is highly appreciated.

There is one general caveat: Error handling is not perfect yet in rustic and we may run into cases where parallel runs may throw errors. E.g. the combination forget/check may lead to check trying to load just-removed snapshots. Or forget/forget may want to remove a just-removed snapshots which then fails. These are however all cases which should not affect the general repository consistency. If you encounter such an error handling problem, please report!

[kapitainsky]

Thank you for clarification.

[simonsan]

Added your answer to the FAQ: https://rustic.cli.rs/docs/FAQ.html#are-all-operations-lock-free