commit 854dbb7fdcc85ca187e4d91a5a85d392242bb1cb
author Alex A Skinner <alex@lx.lc> Sat Aug 30 07:50:50 2014 +0900
committer Mikio Hara <mikioh.mikioh@gmail.com> Sat Aug 30 07:50:50 2014 +0900
tree d0d5c8e58cbe1121b31b2bb3e9261e7d86ab11aa
parent 858c57f5bd2170abe71cbbf505966cd648935d00

net: ensure identical queries are not sent multiple times in builtin stub resolver

Prevents non-rooted queries with > ndots dots from being tried twice on error.
Fixes #8616.

Benchmark results on linux/amd64
benchmark                        old ns/op    new ns/op    delta
BenchmarkGoLookupIPNoSuchHost      8212394      4413293  -46.26%

benchmark                       old allocs   new allocs    delta
BenchmarkGoLookupIPNoSuchHost          216          108  -50.00%

benchmark                        old bytes    new bytes    delta
BenchmarkGoLookupIPNoSuchHost        17460         8726  -50.02%

LGTM=iant, mikioh.mikioh
R=golang-codereviews, iant, mikioh.mikioh
CC=golang-codereviews
https://golang.org/cl/137870043