http: Eliminate ClientRequest capture by Agent socket listeners #10134

evantorrie · 2016-12-06T03:11:55Z

Checklist

make -j8 test (UNIX), or vcbuild test nosign (Windows) passes
tests and/or benchmarks are included
documentation is changed or added
commit message follows commit guidelines

Affected core subsystem(s)

http

Description of change

Eliminate capture of createSocket callback in onFree/onClose/onRemote listeners by moving them to a separate function.

This reduces the heap usage by eliminating the capture in a prior context of the ClientRequest object associated with the first call that opens a socket. Let me know the best way to provide tests for this, as it's non-obvious to me how to do so.

I have provided a heapsnapshot screen shot in the accompanying issue (#10133), and will attach a similar heapsnapshot screen shot showing usage after this fix is included.

cjihrig · 2016-12-06T03:29:18Z

lib/_http_agent.js

    cb(null, s);
  }
 };

+Agent.prototype._installListeners = function installListeners(s, options) {


Can you do this without attaching to the prototype. In its current form, this will become unofficial API that we'll have to maintain.

I changed it to just a file level function.

evantorrie · 2016-12-06T17:49:11Z

@cjihrig Changed per review

cjihrig · 2016-12-06T18:46:22Z

lib/_http_agent.js

    cb(null, s);
  }
 };

+function installListeners(agent, s, options) {
+  var self = agent;


You should be able to replace self with agent now.

evantorrie · 2016-12-07T23:34:50Z

@cjihrig Changes made as requested.

cjihrig

LGTM with one small nit. CI: https://ci.nodejs.org/job/node-test-pull-request/5309/

cjihrig · 2016-12-08T15:25:12Z

lib/_http_agent.js

    cb(null, s);
  }
 };

+function installListeners(agent, s, options) {
+


Can you remove this blank line.

evantorrie · 2016-12-08T20:53:37Z

Removed the blank line. @cjihrig

bnoordhuis

LGTM but can you make sure the commit log conforms to the style guide from CONTRIBUTING.md?

evantorrie · 2016-12-09T00:55:29Z

@bnoordhuis Does that look better? Do you want me to rebase/squash? Or is that something you do on your end?

cjihrig · 2016-12-09T01:13:01Z

The only CI failure was the linter. Does make lint pass for you?

Move the onFree/onClose/onRemote listeners to a separate function

Keepalive sockets that are returned to the agent's freesocket pool were previously capturing a reference to the ClientRequest that initiated the request. This commit eliminates that by moving the installation of the socket listeners to a different function.

evantorrie · 2016-12-09T17:09:27Z

@cjihrig Yes, works for me:

[root@98dc4c605317 node]# git log --oneline -5 --decorate
518d33d (HEAD, agent-retainer) http: eliminate capture of ClientRequest in Agent
eb5b0d3 change self to agent
f774e72 change to local function instead of prototype
3967101 Eliminate capture of "cb" in createSocket context
bc335c0 (upstream/master) doc: buffer allocation throws for negative size
[root@98dc4c605317 node]# scl enable devtoolset-4 python27 -- gmake lint
./node tools/eslint/bin/eslint.js --cache --rulesdir=tools/eslint-rules \
	  benchmark lib test tools
Total errors found: 0
[root@98dc4c605317 node]#

evantorrie · 2016-12-13T17:52:44Z

@cjihrig Is there anything more I need to do here?

bnoordhuis · 2016-12-13T21:57:45Z

CI: https://ci.nodejs.org/job/node-test-pull-request/5393/

evantorrie · 2016-12-14T23:09:18Z

test/arm and test/smartos look like flaky failures unrelated to this change.

evanlucas

LGTM. Running CI one more time to try and get a green build: https://ci.nodejs.org/job/node-test-pull-request/5418/

Thanks!

evantorrie · 2016-12-19T19:20:34Z

These CI failures still look unrelated to this change - are the particular failing tests known to be flaky?

evantorrie · 2016-12-22T21:00:41Z

@evanlucas CI failure seems to be unrelated to this change.

Keepalive sockets that are returned to the agent's freesocket pool were previously capturing a reference to the ClientRequest that initiated the request. This commit eliminates that by moving the installation of the socket listeners to a different function. PR-URL: #10134 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Evan Lucas <evanlucas@me.com> Reviewed-By: James M Snell <jasnell@gmail.com>

jasnell · 2017-01-06T18:15:29Z

Landed in c04d4df

Keepalive sockets that are returned to the agent's freesocket pool were previously capturing a reference to the ClientRequest that initiated the request. This commit eliminates that by moving the installation of the socket listeners to a different function. PR-URL: nodejs#10134 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Evan Lucas <evanlucas@me.com> Reviewed-By: James M Snell <jasnell@gmail.com>

MylesBorins · 2017-03-07T23:53:48Z

This does not land cleanly in LTS. Added dont-land label. Please feel free to manually backport

Keepalive sockets that are returned to the agent's freesocket pool were previously capturing a reference to the ClientRequest that initiated the request. This commit eliminates that by moving the installation of the socket listeners to a different function. Backport-PR-URL: #15500 PR-URL: #10134 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Evan Lucas <evanlucas@me.com> Reviewed-By: James M Snell <jasnell@gmail.com>

nodejs-github-bot added the http Issues or PRs related to the http subsystem. label Dec 6, 2016

cjihrig requested changes Dec 6, 2016

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cjihrig reviewed Dec 6, 2016

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cjihrig approved these changes Dec 8, 2016

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lib/_http_agent.js

cb(null, s);

}

};

function installListeners(agent, s, options) {

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Can you remove this blank line.

nodejs-github-bot added the dont-land-on-v7.x label Dec 8, 2016

addaleax removed the dont-land-on-v7.x label Dec 8, 2016

bnoordhuis approved these changes Dec 8, 2016

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evantorrie changed the title ~~Eliminate capture of "cb" in createSocket context~~ http: Eliminate capture of "cb" by Agent socket listeners Dec 9, 2016

evantorrie changed the title ~~http: Eliminate capture of "cb" by Agent socket listeners~~ http: Eliminate ClientRequest capture by Agent socket listeners Dec 9, 2016

evantorrie force-pushed the agent-retainer branch from 054d7b2 to 97f80b9 Compare December 9, 2016 00:54

evantorrie added 4 commits December 9, 2016 09:04

Eliminate capture of "cb" in createSocket context

3967101

Move the onFree/onClose/onRemote listeners to a separate function

change to local function instead of prototype

f774e72

change self to agent

eb5b0d3

evantorrie force-pushed the agent-retainer branch from 97f80b9 to 518d33d Compare December 9, 2016 17:10

Fishrock123 added dont-land-on-v7.x and removed dont-land-on-v7.x labels Dec 9, 2016

evanlucas approved these changes Dec 15, 2016

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jasnell approved these changes Jan 6, 2017

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jasnell closed this Jan 6, 2017

lance mentioned this pull request Jan 19, 2017

http.Agent free sockets maintain reference to initial ClientRequest object until the socket is destroyed/closed #10133

Closed

italoacasas mentioned this pull request Jan 25, 2017

Proposal to update v7.x-staging #10989

Closed

italoacasas mentioned this pull request Jan 29, 2017

v7.5.0 proposal #11062

Merged

MylesBorins added dont-land-on-v4.x labels Mar 7, 2017

drewfish mentioned this pull request Sep 19, 2017

backport http: Eliminate ClientRequest capture by Agent socket listeners nodejs/Release#247

Closed

lpinca mentioned this pull request Sep 21, 2017

[v6.x backport] http: eliminate capture of ClientRequest in Agent #15500

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4 tasks

gibfahn added backport-requested-v6.x and removed dont-land-on-v6.x labels Sep 22, 2017

MylesBorins added backported-to-v6.x and removed backport-requested-v6.x labels Sep 22, 2017

MylesBorins mentioned this pull request Sep 22, 2017

v6.11.4 proposal #15506

Merged

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http: Eliminate ClientRequest capture by Agent socket listeners #10134

http: Eliminate ClientRequest capture by Agent socket listeners #10134

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http: Eliminate ClientRequest capture by Agent socket listeners #10134

http: Eliminate ClientRequest capture by Agent socket listeners #10134

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Affected core subsystem(s)

Description of change

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