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net: native unix dns lookup retries unnecessarily #8616

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gopherbot opened this issue Aug 29, 2014 · 5 comments
Closed

net: native unix dns lookup retries unnecessarily #8616

gopherbot opened this issue Aug 29, 2014 · 5 comments
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@gopherbot
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@gopherbot gopherbot commented Aug 29, 2014

by alex@lx.lc:

In dnsclient_unix.go, the lookup function needs to be cleaned up.

Currently, in certain cases, lookups are tried twice unnecessarily.  

A lookup is tried twice if it
1 - has more dots than ndots
2 - is not rooted (doesn't end with .)
3 - returns any error(including NXDOMAIN).

This leads to ALL nosuchhost lookups being tried twice necessarily basically.
@ianlancetaylor
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@ianlancetaylor ianlancetaylor commented Aug 29, 2014

Comment 1:

Labels changed: added repo-main, release-none.
@gopherbot
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@gopherbot gopherbot commented Aug 29, 2014

Comment 2 by alski85:

Have patch for this, will submit CL soon.
@gopherbot
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@gopherbot gopherbot commented Aug 29, 2014

Comment 3 by alex@lx.lc:

Have patch for this, will submit CL soon.
@gopherbot
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@gopherbot gopherbot commented Aug 29, 2014

Comment 4:

CL https://golang.org/cl/137870043 mentions this issue.
@mikioh
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@mikioh mikioh commented Aug 29, 2014

Comment 5:

This issue was closed by revision 854dbb7.

Status changed to Fixed.
@golang golang locked and limited conversation to collaborators Jun 25, 2016
wheatman added a commit to wheatman/go-akaros that referenced this issue Jun 25, 2018
@axaxs @wheatman
net: ensure identical queries are not sent multiple times in builtin …
ebe92a2 
…stub resolver

Prevents non-rooted queries with > ndots dots from being tried twice on error.
Fixes golang#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
wheatman added a commit to wheatman/go-akaros that referenced this issue Jul 9, 2018
@axaxs @wheatman
net: ensure identical queries are not sent multiple times in builtin …
fe6a0c1 
…stub resolver

Prevents non-rooted queries with > ndots dots from being tried twice on error.
Fixes golang#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
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@mikioh @ianlancetaylor @gopherbot