[tor-bugs] #19913 [Metrics/CollecTor]: prevent OOM in CollecTor

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#19913: prevent OOM in CollecTor
-------------------------------+------------------------------
 Reporter:  iwakeh             |          Owner:  iwakeh
     Type:  defect             |         Status:  needs_review
 Priority:  High               |      Milestone:
Component:  Metrics/CollecTor  |        Version:
 Severity:  Major              |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
-------------------------------+------------------------------
Changes (by iwakeh):

 * status:  new => needs_review


Comment:

 The responsible module was relaydescs ArchiveWriter.  updateindex and
 exitlists should be fine.

 The other modules should be investigated.

 I tested the following patch on the mirror; the repeated heap-dumps look
 very healthy with the patch.

 Please review
 [https://gitweb.torproject.org/user/iwakeh/collector.git/commit/?h=task-19913&id=e43626580a5fea82619108c4dc22a291b94e59c2
 my branch].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19913#comment:1>
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