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test: fix flaky test-fs-watch-recursive on OS X #9303

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@Trott Trott commented Oct 26, 2016

Checklist
  • make -j8 test (UNIX), or vcbuild test nosign (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)

test fs

Description of change

The test was sometimes timing out due to a race condition. In OS X,
events for fs.watch() might only start showing up after a delay. This
is a limitation of the operating system. To work around that, there was
a timer in the test that delayed the writing of the file by 100ms.
However, sometimes that was not enough, and so the event never fired,
and the test timed out.

Change the timer to an interval so that it fires repeatedly until it is
picked up. This change only affects OS X.

Fixes: #8511

/cc @nodejs/testing

The test was sometimes timing out due to a race condition. In OS X,
events for `fs.watch()` might only start showing up after a delay. This
is a limitation of the operating system. To work around that, there was
a timer in the test that delayed the writing of the file by 100ms.
However, sometimes that was not enough, and so the event never fired,
and the test timed out.

Change the timer to an interval so that it fires repeatedly until it is
picked up. This change only affects OS X.

Fixes: nodejs#8511
@Trott Trott added fs Issues and PRs related to the fs subsystem / file system. test Issues and PRs related to the tests. macos Issues and PRs related to the macOS platform / OSX. labels Oct 26, 2016
@nodejs-github-bot nodejs-github-bot added the test Issues and PRs related to the tests. label Oct 26, 2016
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Trott commented Oct 26, 2016

@gerges-beshay
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@Trott, what about updating "watcherClosed" to use "let", and "interval" to use "const"?

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Trott commented Oct 26, 2016

Linter passed, OS X passed, and Windows passed. The test does not run on any other platforms. So CI looks ✅ as far as relevant results go.

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Trott commented Oct 28, 2016

@Trott, what about updating "watcherClosed" to use "let", and "interval" to use "const"?

Not using const for interval because it needs to be used outside the block where it is declared.

I don't a great a reason for avoiding let here, but this is my so-so reason: I generally don't use let because there are situations where it is not performant in V8 with certain types of loops. Rather than having to remember in what situations let is performant, I'm just not using it at all until the performance issues are overcome. Granted, worrying about performance of a boolean in a test is overkill. So... ¯_(ツ)_/¯

Trott added a commit to Trott/io.js that referenced this pull request Oct 29, 2016
The test was sometimes timing out due to a race condition. In OS X,
events for `fs.watch()` might only start showing up after a delay. This
is a limitation of the operating system. To work around that, there was
a timer in the test that delayed the writing of the file by 100ms.
However, sometimes that was not enough, and so the event never fired,
and the test timed out.

Change the timer to an interval so that it fires repeatedly until it is
picked up. This change only affects OS X.

Fixes: nodejs#8511
PR-URL: nodejs#9303
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Santiago Gimeno <[email protected]>
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Trott commented Oct 29, 2016

Landed in fd54df1

@Trott Trott closed this Oct 29, 2016
evanlucas pushed a commit that referenced this pull request Nov 3, 2016
The test was sometimes timing out due to a race condition. In OS X,
events for `fs.watch()` might only start showing up after a delay. This
is a limitation of the operating system. To work around that, there was
a timer in the test that delayed the writing of the file by 100ms.
However, sometimes that was not enough, and so the event never fired,
and the test timed out.

Change the timer to an interval so that it fires repeatedly until it is
picked up. This change only affects OS X.

Fixes: #8511
PR-URL: #9303
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Santiago Gimeno <[email protected]>
MylesBorins pushed a commit that referenced this pull request Nov 22, 2016
The test was sometimes timing out due to a race condition. In OS X,
events for `fs.watch()` might only start showing up after a delay. This
is a limitation of the operating system. To work around that, there was
a timer in the test that delayed the writing of the file by 100ms.
However, sometimes that was not enough, and so the event never fired,
and the test timed out.

Change the timer to an interval so that it fires repeatedly until it is
picked up. This change only affects OS X.

Fixes: #8511
PR-URL: #9303
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Santiago Gimeno <[email protected]>
MylesBorins pushed a commit that referenced this pull request Nov 22, 2016
The test was sometimes timing out due to a race condition. In OS X,
events for `fs.watch()` might only start showing up after a delay. This
is a limitation of the operating system. To work around that, there was
a timer in the test that delayed the writing of the file by 100ms.
However, sometimes that was not enough, and so the event never fired,
and the test timed out.

Change the timer to an interval so that it fires repeatedly until it is
picked up. This change only affects OS X.

Fixes: #8511
PR-URL: #9303
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Santiago Gimeno <[email protected]>
This was referenced Nov 22, 2016
@Trott Trott deleted the fix-flaky-on-osx branch January 13, 2022 22:44
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Investigate flaky test-fs-watch-recursive on OS X
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