stream: readable read one buffer at a time by ronag · Pull Request #60441 · nodejs/node

ronag · 2025-10-27T18:44:50Z

Instead of wasting cycles concatenating buffers, just return each
one by one.
Similar (but not exact) old behavior can be achieved by using
`readable.read(readable.readableLength)` instead of
`readable.read()`. In some edge cases it might be necessary
to do a `readable.read(0)` first.

nodejs-github-bot · 2025-10-27T18:44:55Z

Review requested:

@nodejs/streams

mcollina

code lgtm

I think some docs changes are needed

mcollina · 2026-01-02T08:05:20Z

Marked as semver-major.

lpinca · 2026-01-02T08:27:37Z

I'm -1 on this unless there is a strong reason for it. Historically, readable.read() has always returned all queued data. If this lands, I think that the easiest workaround for modules affected by the breaking change would be replacing readable.read() with readable.read(readable.readableLength).

ronag · 2026-01-02T08:48:08Z

I'm -1 on this unless there is a strong reason for it.

The performance overhead is huge. As it stand we should at least add a note to avoid this api for anything performance sensitive.

If this lands, I think that the easiest workaround for modules affected by the breaking change would be replacing readable.read() with readable.read(readable.readableLength).

Good point.

ronag · 2026-01-02T08:51:56Z

I think some docs changes are needed

What doc changes are you roughly asking for?

github-actions · 2026-01-02T08:58:57Z

Failed to start CI

 ⚠ Commits were pushed since the last approving review:
⚠ - stream: readable read one buffer at a time
✘ Refusing to run CI on potentially unsafe PR

https://github.com/nodejs/node/actions/runs/20654449594

mcollina

lgtm

nodejs-github-bot · 2026-01-05T08:51:29Z

CI: https://ci.nodejs.org/job/node-test-pull-request/70672/

Instead of wasting cycles concatenating buffers, just return each one by one. Similar (but not exact) old behavior can be achieved by using `readable.read(readable.readableLength)` instead of `readable.read()`. In some edge cases it might be necessary to do a `readable.read(0)` first. PR: nodejs#60441

ronag · 2026-01-05T09:27:53Z

@lpinca Do you need help fixing ws in relation to this PR or can you deal with it yourself?

mcollina

lgtm

nodejs-github-bot · 2026-01-05T09:53:06Z

CI: https://ci.nodejs.org/job/node-test-pull-request/70676/

lpinca · 2026-01-05T09:53:46Z

@lpinca Do you need help fixing ws in relation to this PR or can you deal with it yourself?

I've already fixed it in websockets/ws@1998485

ronag · 2026-01-05T09:54:54Z

CITGM: https://ci.nodejs.org/view/Node.js-citgm/job/citgm-smoker/3663/

nodejs-github-bot · 2026-01-05T21:27:50Z

CI: https://ci.nodejs.org/job/node-test-pull-request/70687/

mcollina

lgtm

gurgunday

lgtm

nodejs-github-bot · 2026-01-20T21:08:50Z

Commit Queue failed

- Loading data for nodejs/node/pull/60441
✔ Done loading data for nodejs/node/pull/60441
----------------------------------- PR info ------------------------------------
Title stream: readable read one buffer at a time (#60441)
Author Robert Nagy <ronagy@icloud.com> (@ronag)
Branch ronag:read-no-copy -> nodejs:main
Labels stream, semver-major, author ready, needs-ci, needs-citgm
Commits 1
- stream: readable read one buffer at a time
Committers 1
- Robert Nagy <ronagy@icloud.com>
PR-URL: https://github.com/nodejs/node/pull/60441
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/60441
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
--------------------------------------------------------------------------------
ℹ This PR was created on Mon, 27 Oct 2025 18:44:50 GMT
✔ Approvals: 3
✔ - Matteo Collina (@mcollina) (TSC): https://github.com/nodejs/node/pull/60441#pullrequestreview-3631894479
✔ - Luigi Pinca (@lpinca): https://github.com/nodejs/node/pull/60441#pullrequestreview-3632251382
✔ - Gürgün Dayıoğlu (@gurgunday): https://github.com/nodejs/node/pull/60441#pullrequestreview-3635847744
✘ semver-major requires at least 2 TSC approvals
✔ Last GitHub CI successful
ℹ Last Full PR CI on 2026-01-05T21:27:50Z: https://ci.nodejs.org/job/node-test-pull-request/70687/
ℹ Last CITGM CI on 2026-01-05T09:54:54Z: https://ci.nodejs.org/view/Node.js-citgm/job/citgm-smoker/3663/
- Querying data for job/node-test-pull-request/70687/
✔ Build data downloaded
✔ Last Jenkins CI successful
--------------------------------------------------------------------------------
✔ Aborted `git node land` session in /home/runner/work/node/node/.ncu

https://github.com/nodejs/node/actions/runs/21187285768

mcollina · 2026-01-20T22:07:52Z

@nodejs/tsc can I get another approval?

nodejs-github-bot · 2026-01-21T08:29:42Z

Landed in fadb214

ronag requested a review from mcollina October 27, 2025 18:44

nodejs-github-bot added needs-ci PRs that need a full CI run. stream Issues and PRs related to the stream subsystem. labels Oct 27, 2025

MattiasBuelens reviewed Oct 31, 2025
View reviewed changes

Comment threadtest/parallel/test-stream-readable-infinite-read.js Outdated

mcollina approved these changes Jan 2, 2026
View reviewed changes

mcollina added the semver-major PRs that contain breaking changes and should be released in the next major version. label Jan 2, 2026

ronag force-pushed the read-no-copy branch 2 times, most recently from a380c35 to 0798db8Compare January 2, 2026 08:55

ronag force-pushed the read-no-copy branch from 0798db8 to 0d7fcaeCompare January 2, 2026 08:56

ronag marked this pull request as ready for review January 2, 2026 08:56

ronag added the request-ci Add this label to start a Jenkins CI on a PR. label Jan 2, 2026

ronag force-pushed the read-no-copy branch from 0d7fcae to 8cec69cCompare January 2, 2026 08:57

ronag force-pushed the read-no-copy branch from 8cec69c to 876ff79Compare January 2, 2026 08:58

ronag force-pushed the read-no-copy branch from 876ff79 to 01a9ec9Compare January 2, 2026 08:58

github-actionsBot added request-ci-failed An error occurred while starting CI via request-ci label, and manual interventon is needed. and removed request-ci Add this label to start a Jenkins CI on a PR. labels Jan 2, 2026

ronag added request-ci Add this label to start a Jenkins CI on a PR. and removed request-ci-failed An error occurred while starting CI via request-ci label, and manual interventon is needed. labels Jan 2, 2026

github-actionsBot added request-ci-failed An error occurred while starting CI via request-ci label, and manual interventon is needed. and removed request-ci Add this label to start a Jenkins CI on a PR. labels Jan 2, 2026

mcollina approved these changes Jan 4, 2026
View reviewed changes

ronag added the request-ci Add this label to start a Jenkins CI on a PR. label Jan 5, 2026

github-actionsBot removed the request-ci Add this label to start a Jenkins CI on a PR. label Jan 5, 2026

ronag force-pushed the read-no-copy branch from 87cabd8 to 7a0cba0Compare January 5, 2026 09:20

mcollina approved these changes Jan 5, 2026
View reviewed changes

ronag added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Jan 6, 2026

mcollina approved these changes Jan 6, 2026
View reviewed changes

ronag requested review from jasnell and lpinca January 6, 2026 18:34

lpinca approved these changes Jan 6, 2026
View reviewed changes

gurgunday approved these changes Jan 7, 2026
View reviewed changes

mcollina added the commit-queue Add this label to land a pull request using GitHub Actions. label Jan 20, 2026

nodejs-github-bot added commit-queue-failed An error occurred while landing this pull request using GitHub Actions. and removed commit-queue Add this label to land a pull request using GitHub Actions. labels Jan 20, 2026

anonrig approved these changes Jan 21, 2026
View reviewed changes

mcollina added commit-queue Add this label to land a pull request using GitHub Actions. and removed commit-queue-failed An error occurred while landing this pull request using GitHub Actions. labels Jan 21, 2026

RafaelGSS mentioned this pull request Apr 27, 2026
2026-05-05, Version 26.0.0 (Current) #62526
Merged

alleria173 mentioned this pull request Jul 28, 2026
Feat/node 26 support gchq/CyberChef#2699
Open

Uh oh!

Uh oh!

Conversation

ronag commented Oct 27, 2025• edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

nodejs-github-bot commented Oct 27, 2025• edited by ronag Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

Uh oh!

mcollina left a comment

Choose a reason for hiding this comment

Uh oh!

mcollina commented Jan 2, 2026

Uh oh!

lpinca commented Jan 2, 2026• edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

ronag commented Jan 2, 2026• edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

ronag commented Jan 2, 2026

Uh oh!

github-actionsBot commented Jan 2, 2026

Uh oh!

mcollina left a comment

Choose a reason for hiding this comment

Uh oh!

nodejs-github-bot commented Jan 5, 2026

Uh oh!

ronag commented Jan 5, 2026

Uh oh!

mcollina left a comment

Choose a reason for hiding this comment

Uh oh!

nodejs-github-bot commented Jan 5, 2026

Uh oh!

lpinca commented Jan 5, 2026

Uh oh!

ronag commented Jan 5, 2026

Uh oh!

nodejs-github-bot commented Jan 5, 2026

Uh oh!

mcollina left a comment

Choose a reason for hiding this comment

Uh oh!

gurgunday left a comment

Choose a reason for hiding this comment

Uh oh!

nodejs-github-bot commented Jan 20, 2026

Uh oh!

mcollina commented Jan 20, 2026

Uh oh!

nodejs-github-bot commented Jan 21, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

7 participants

ronag commented Oct 27, 2025•
edited
Loading

nodejs-github-bot commented Oct 27, 2025•
edited by ronag
Loading

lpinca commented Jan 2, 2026•
edited
Loading

ronag commented Jan 2, 2026•
edited
Loading