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Re: [Duplicity-talk] Re: Re: Can one safely run multiple instances tothe
From: |
Peter Schuller |
Subject: |
Re: [Duplicity-talk] Re: Re: Can one safely run multiple instances tothesame target? |
Date: |
Tue, 18 Mar 2008 16:09:33 +0100 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
> I'm not entirely sure. One thing that one could conceivably do is something
> like "heartbeat" file whose timestamp is updated every XXX seconds. If you
> set duplicity to produce a 5s heartbeat, a second instance would expect to
> see that file's timestamp be modified within 5 seconds. If not, then the
> original duplicity likely failed. Obviously, this is a very basic concept
> that I'm describing; I'd probably have the second instance wait a factor of
> the heartbeat timeout before it were to determine that the lock was stale.
> Of course, this would imply 2 simultaneous connections from duplicity to the
> backend; one to upload the file, and one to keep the heartbeat updated. I
> don't know how easy it is to develop multi-threaded things in python ... i'm
> just brainstorming a little.
My mkdir() lock was actually meant to be local, rather than on the
backend. While a lock on the actual backend would be useful, that is
going to be more problematic to do portably. It is also likely to
cause a very high amount of false positives in many situations, as any
failures due to communication will generate stale files. With a local
lock, only harder local crashes would cause false positives.
--
/ Peter Schuller
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- [Duplicity-talk] Can one safely run multiple instances to the same target?, Eric B., 2008/03/13
- Re: [Duplicity-talk] Can one safely run multiple instances to the same target?, Kenneth Loafman, 2008/03/13
- Re: [Duplicity-talk] Can one safely run multiple instances to the same target?, Peter Schuller, 2008/03/14
- Re: [Duplicity-talk] Can one safely run multiple instances to the same target?, enderst, 2008/03/14
- Re: [Duplicity-talk] Can one safely run multiple instances to the same target?, Peter Schuller, 2008/03/14
- Re: [Duplicity-talk] Can one safely run multiple instances to the same target?, Kenneth Loafman, 2008/03/14
- [Duplicity-talk] Re: Can one safely run multiple instances to thesame target?, Eric B., 2008/03/15
- Re: [Duplicity-talk] Re: Can one safely run multiple instances to thesame target?, Peter Schuller, 2008/03/15
- [Duplicity-talk] Re: Re: Can one safely run multiple instances tothesame target?, Eric B., 2008/03/15
- Re: [Duplicity-talk] Re: Re: Can one safely run multiple instances tothesame target?,
Peter Schuller <=