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Add a comment about _LimitedHostnameResolver
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@ -334,6 +334,13 @@ def install_dns_limiter(reactor, max_dns_requests_in_flight=100):
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This is to workaround https://twistedmatrix.com/trac/ticket/9620, where we
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can run out of file descriptors and infinite loop if we attempt to do too
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many DNS queries at once
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XXX: I'm confused by this. reactor.nameResolver does not use twisted.names unless
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you explicitly install twisted.names as the resolver; rather it uses a GAIResolver
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backed by the reactor's default threadpool (which is limited to 10 threads). So
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(a) I don't understand why twisted ticket 9620 is relevant, and (b) I don't
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understand why we would run out of FDs if we did too many lookups at once.
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-- richvdh 2020/08/29
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"""
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new_resolver = _LimitedHostnameResolver(
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reactor.nameResolver, max_dns_requests_in_flight
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