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plugin/forward: make Yield not block (#3336)

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* plugin/forward: may Yield not block

Yield may block when we're super busy with creating (and looking) for
connection. Set a small timeout on Yield, to skip putting the connection
back in the queue.

Use persistentConn troughout the socket handling code to be more
consistent.

Signed-off-by: Miek Gieben <miek@miek.nl>

Dont do

Signed-off-by: Miek Gieben <miek@miek.nl>

* Set used in Yield

This gives one central place where we update used in the persistConns

Signed-off-by: Miek Gieben <miek@miek.nl>
This commit is contained in:
Miek Gieben
2019-10-01 16:39:42 +01:00
committed by GitHub
parent 7b69dfebb5
commit 2d98d520b5
8 changed files with 53 additions and 105 deletions
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plugin/forward/README.md
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@@ -102,7 +102,6 @@ If monitoring is enabled (via the *prometheus* directive) then the following met
* `coredns_forward_healthcheck_failure_count_total{to}` - number of failed health checks per upstream.
* `coredns_forward_healthcheck_broken_count_total{}` - counter of when all upstreams are unhealthy,
and we are randomly (this always uses the `random` policy) spraying to an upstream.
* `coredns_forward_socket_count_total{to}` - number of cached sockets per upstream.
Where `to` is one of the upstream servers (**TO** from the config), `rcode` is the returned RCODE
from the upstream.