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inspector: Use default uv_listen backlog size #20254

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merged 1 commit into from
Apr 26, 2018
Merged

inspector: Use default uv_listen backlog size #20254

merged 1 commit into from
Apr 26, 2018

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eugeneo
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@eugeneo eugeneo commented Apr 24, 2018

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. dont-land-on-v4.x inspector Issues and PRs related to the V8 inspector protocol labels Apr 24, 2018
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eugeneo commented Apr 24, 2018

CI: https://ci.nodejs.org/job/node-test-pull-request/14478/

So far, this issue was only hit by a test case but there's a potential for it to be hit if some tool sends too many requests too fast.

@eugeneo eugeneo mentioned this pull request Apr 24, 2018
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Trott commented Apr 24, 2018

The provided test doesn't fail when node is compiled without the source change. Shouldn't it? Or is it a "sometimes it fails, sometimes it doesn't" kind of test?

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Trott commented Apr 24, 2018

The provided test doesn't fail when node is compiled without the source change. Shouldn't it? Or is it a "sometimes it fails, sometimes it doesn't" kind of test?

The problem is that if it starts failing that way, then no one is going to think it's a bug in the code. They're going to think the test is unreliable and "fix" it rather than the bug in the code.

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Trott commented Apr 24, 2018

Although I did just confirm that this un-breaks parallel/test-inspector-multisession-ws from #20137 on macOS. So, maybe that's the "real" test for this. My question above is non-blocking (at least, non-blocking for me).

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Trott commented Apr 24, 2018

CI: https://ci.nodejs.org/job/node-test-pull-request/14479/

@Trott Trott added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Apr 24, 2018
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Trott commented Apr 24, 2018

@nodejs/v8-inspector

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eugeneo commented Apr 24, 2018

The provided test doesn't fail when node is compiled without the source change. Shouldn't it? Or is it a "sometimes it fails, sometimes it doesn't" kind of test?

It reliably fails for me on macOS. But it is timing related - new client needs to attempt connection while the inspector still have not accepted the previous connection.

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eugeneo commented Apr 24, 2018

Looks like the test fails on Docker bots. I will reduce the number of connection attempts to 10 and will try again. I tried 10 connections on my Mac and I see failures roughly 8 runs out of 10.

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I am trying to find out how the value 0 ends up picking the uv default size. AFAICT, uv_listen simply passes this onto listen(2) here. I see no indication that 0 is special as far as uv is concerned.

In the man pages for either mac or on Linux, I cannot find reference to the value 0 being special either. Am I missing something?

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eugeneo commented Apr 24, 2018

@ofrobots you are right, that seems to be a bad value. I simply tried it while debugging the test value, it worked on Mac but seems to be a bad value for Linux. I changed to 511 as that's what the net module uses - https://github.com/nodejs/node/blob/master/lib/net.js#L1327

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bnoordhuis approved these changes Apr 24, 2018
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LGTM with a comment about the test.

In the man pages for either mac or on Linux, I cannot find reference to the value 0 being special either.

It is on macos; 0 makes it default to kern.ipc.somaxconn (normally 128.)

test/parallel/test-inspector-stress-http.js Outdated
console.log(`Interation ${number} done`);
return response;
} catch (e) {
console.error(`Iteration ${number} failed`, e);
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Shouldn't the exception bubble up? Also, there seems to be no point in returning response.

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Many relevant CI failures along the lines of:

16:51:36 not ok 1862 parallel/test-inspector-stress-http
16:51:36   ---
16:51:36   duration_ms: 120.69
16:51:36   severity: fail
16:51:36   exitcode: -15
16:51:36   stack: |-
16:51:36     timeout

Moving the test to sequential rather than parallel may fix it, or at least help a bit.

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eugeneo commented Apr 24, 2018

@Trott - I believe that was an old run. That timeout was a result of the 0 backlog on Linux.

Green CI: https://ci.nodejs.org/job/node-test-commit/17997/

@Trott Trott dismissed their stale review April 24, 2018 23:54

happy to be wrong!

@eugeneo
inspector: Use default uv_listen backlog size
71059fb 
PR-URL: #20254
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Ali Ijaz Sheikh <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
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eugeneo commented Apr 26, 2018

Test was updated, the CI is still green: https://ci.nodejs.org/job/node-test-pull-request/14529/

Will land now

@eugeneo eugeneo merged commit 71059fb into nodejs:master Apr 26, 2018
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eugeneo commented Apr 26, 2018

Landed as 71059fb

@eugeneo eugeneo deleted the http-backlog branch April 26, 2018 17:21
MylesBorins pushed a commit that referenced this pull request May 4, 2018
@MylesBorins
inspector: Use default uv_listen backlog size
375994f 
PR-URL: #20254
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Ali Ijaz Sheikh <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
@MylesBorins MylesBorins mentioned this pull request May 8, 2018
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@trivikr trivikr trivikr approved these changes

@TimothyGu TimothyGu TimothyGu approved these changes

@Trott Trott Trott approved these changes

@bnoordhuis bnoordhuis bnoordhuis approved these changes

@ofrobots ofrobots ofrobots approved these changes

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