[tor-bugs] #19720 [Metrics/CollecTor]: CollecTor should be re-configurable without restart

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#19720: CollecTor should be re-configurable without restart
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 Reporter:  iwakeh             |          Owner:  iwakeh
     Type:  enhancement        |         Status:  needs_review
 Priority:  High               |      Milestone:  CollecTor 1.0.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:  ctip               |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Comment (by karsten):

 The impatient?  Nooo, not true.  The forgetful and easily confused!

 Okay, one question and two suggestions:
  - What happens if the operator breaks the configuration file?  Will
 current module runs be affected, that is, will they be aborted together
 with the scheduler?  If not, will the scheduler make another attempt to
 re-read the configuration file 60 (or 5) seconds later?  And if so, will
 it warn every 60 (or 5) seconds that the configuration is broken?  Okay,
 that's more than one question, but these seem related.
  - 10 or 15 seconds might work, too, if 5 is too small.  Just enough to
 save the file and `tail -f` the log file to see how the changes are
 processed.  So, I'd say anything between 5 and 15 would work, please pick
 your favorite.
  - The behavior of all this should be described at the top of
 `collector.properties`, so that operators know exactly what will happen
 when they edit the file while CollecTor is running rather than having to
 learn it from the logs after it has happened.

 Sorry to make this more difficult, but I'm thinking of all the services
 I'm running and how to memorize how to do that, and I'm thinking of
 external folks running our services in the near future and making this as
 easy as possible for them.  Thanks!

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Ticket URL: <https://troodi.torproject.org/projects/tor/ticket/19720#comment:10>
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