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Re: [tor-bugs] #19016 [Metrics/CollecTor]: add shutdown hook



#19016: add shutdown hook
-------------------------------+---------------------------------
 Reporter:  iwakeh             |          Owner:  iwakeh
     Type:  enhancement        |         Status:  needs_revision
 Priority:  Low                |      Milestone:  CollecTor 1.1.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:  ctip               |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
-------------------------------+---------------------------------

Comment (by iwakeh):

 Thanks, for the suggestions!

 I think there is no way to catch a second `kill` signal; the shutdown
 thread is only called once by the jvm.

 The 20 min waiting time is pretty arbitrary and could only be fully used
 by relaydesc module anyway, afaict.
 I thought that it should accommodate a just started relaydesc download to
 finish properly to make sense.

 Maybe this grace period should be made configurable to give operators
 better control?

 Please review
 [https://gitweb.torproject.org/user/iwakeh/collector.git/commit/?h=task-19016
 -shutdown-hook&id=7cec1c874adffd14b7f152e289a0ccdc7cac7ad5 my branch] with
 the additional log-stmt and w/o the redundant imports (Thanks for spotting
 these!);
 and
 [https://gitweb.torproject.org/user/iwakeh/collector.git/commit/?h=task-19016
 -shutdown-hook&id=cb78f5fe5b30dc138bb545c8f26b95b7abc90d9d another commit]
 with a configurable grace period.

 With the configurable grace period the change log needs to be adapted
 otherwise it's fine.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19016#comment:9>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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