[tor-bugs] #20320 [Metrics/metrics-lib]: Avoid running into an IOException and logging a warning for it

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#20320: Avoid running into an IOException and logging a warning for it
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 Reporter:  karsten              |          Owner:  karsten
     Type:  defect               |         Status:  needs_review
 Priority:  Low                  |      Milestone:
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Comment (by iwakeh):

 Coincidence? While testing the sync-functionality I ran into that exact
 IOE today, and solved it similarly.
 The patch is fine.
 Can it wait for the big patch?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20320#comment:2>
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