coredns: work on tcp requests concurrently #503
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Add a 3s timeout to all tcp connections, we do not want clients to keep the connections open forever. Also do not allow more than one message per connection. The API is a bit weird, we first get the message then have to poll again where it return None otherwise the reply will not be send. Signed-off-by: Paul Holzinger <pholzing@redhat.com>
Right now for a single network all requests where processed serial and with tcp a caller is able to block us for a long time if it just opens the connection but sends very little or no data. To avoid this always spawn a new task if we accept a new tcp connection. We could do the same for udp however my testing with contrib/perf/run.sh has shown that it slows things down as the overhead of spawning a task is greater than the few quick simple map lookups so we only spawn where needed. We still have to spawn when forwarding external requests as this can take a long time. Fixes containers#500 Signed-off-by: Paul Holzinger <pholzing@redhat.com>
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@mheon PTAL |
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yeah! LGTM |
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Tests failed. @containers/packit-build please check. |
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/lgtm |
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Right now for a single network all requests where processed serial and
with tcp a caller is able to block us for a long time if it just opens
the connection but sends very little or no data. To avoid this always
spawn a new task if we accept a new tcp connection.
We could do the same for udp however my testing with contrib/perf/run.sh
has shown that it slows things down as the overhead of spawning a task
is greater than the few quick simple map lookups so we only spawn where
needed. We still have to spawn when forwarding external requests as this
can take a long time.
Fixes #500