[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2952: Runtime reconfiguration

[Tahoe-LAFS]

#2952: Runtime reconfiguration
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 Reporter:  cypher                  |          Owner:
     Type:  enhancement             |         Status:  new
 Priority:  normal                  |      Milestone:  undecided
Component:  code                    |        Version:  1.12.1
 Keywords:  usability magic-folder  |  Launchpad Bug:
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 Currently, any configuration-related changes made to a local Tahoe-LAFS
 node (e.g., editing `tahoe.cfg`, adding new storage servers via
 `private/servers.yaml`, or creating/joining magic-folders) will require
 that that node be restarted in order for the changes to take effect.
 Restarting a node during use, however, will naturally interrupt current
 upload/download operations and introduce additional user-facing delays
 (since, e.g., the `restart` command will typically take a couple of
 seconds to complete, additional time is needed for clients/nodes to
 reconnect, and so on).

 Accordingly, it would be useful if "live" reconfiguration could be
 performed at runtime with any changes going into effect immediately and/or
 without requiring a full node restart. As one solution, perhaps the web
 API could be extended to support getting/setting various configuration
 params via GET/PUT/DELETE/POST methods (e.g., with `POST
 /config/node?nickname=TestGrid` being equivalent to setting
 `[node]nickname=TestGrid` in `tahoe.cfg` and restarting). As a weaker (but
 still useful) solution, perhaps a `tahoe reload` CLI command could be
 introduced that would reload and apply any/all configuration changes
 without interrupting in-progress operations.

 Of course, at this stage, these are just simple ideas but I would welcome
 additional input and discussion from anyone who may be interested on how
 to best implement something along these lines. :)

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2952>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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