[tahoe-lafs-trac-stream] [tahoe-lafs] #2053: make "tahoe backup" avoid "piling up" if the backup job takes longer than the period

[tahoe-lafs]

#2053: make "tahoe backup" avoid "piling up" if the backup job takes longer than
the period
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     Reporter:  zooko        |      Owner:  daira
         Type:  enhancement  |     Status:  new
     Priority:  normal       |  Milestone:  undecided
    Component:  unknown      |    Version:  1.10.0
   Resolution:               |   Keywords:  tahoe-backup
Launchpad Bug:               |
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Comment (by daira):

 The tricky design decision here is how to detect that another backup is
 running (since they will be in different processes, currently). I can
 think of several possibilities:

 1. Move the backup job into the gateway.
 2. Have a longer-running process (perhaps the gateway but not necessarily)
 schedule backups and ensure mutual exclusion.
 3. Have the backup process acquire a lock (perhaps just by opening the
 backupdb in exclusive mode) while it runs.

 3 seems simplest starting from where we are.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2053#comment:1>
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