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Add filesystem locking on jetstream fileStore instances. #4407

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Add filesystem locking on jetstream fileStore instances. #4407

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Commits on Aug 22, 2023

  1. Add filesystem locking on jetstream fileStore instances. 

    Running two instances of the server which share the same directory (e.g.
default configuration `/tmp/nats/jetstream') will corrupt each other.

We mitigate by creating an empty file called LOCK in the directory and then
acquire a flock(2) on it.

Signed-off-by: Jason Volk <jason@zemos.net>
    @jevolk
    jevolk committed Aug 22, 2023
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