Split FileStreamMetrics into its own module#21340
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comphead merged 3 commits intoapache:mainfrom Apr 3, 2026
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alamb
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Apr 3, 2026
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This code is just moved into its own module in the first commit
I also had to touch up the links in the documentation which I did in its own commit for easier review
This was referenced Apr 3, 2026
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Thanks, makes a lot of sense
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Thanks @comphead |
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Stacked on - #21327 - #21340 ## Which issue does this PR close? - part of #20529 - Broken out of #20820 ## Rationale for this change The Morsel API allows for finer grain parallelism (and IO). It is important to have the FileStream work in terms of the Morsel API to allow future features (like workstealing, etc) ## What changes are included in this PR? I apologize for the large diff; Note about 1/2 of this PR is tests and a test framework to test the calling sequence of FileStream. 1. Rewrite FileStream in terms of the MorselAPI 2. Add snapshot driven test to document the I/O and CPU patterns in FileStream 3. Add snapshot based tests that show the ordering of files ## Are these changes tested? Yes by existing functional and benchmark tests, as well as new functional snapshot based tests ## Are there any user-facing changes? No (not yet) --------- Co-authored-by: Adrian Garcia Badaracco <1755071+adriangb@users.noreply.github.com>
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Which issue does this PR close?
Rationale for this change
@Dandandan, @adriangb and I are in the process of significantly reworking how FileStream works internally (morsels!)
As the FileStream will get more complicated, it needs a better structure than one giant module to ensure we can work with it. I am trying to do this as incremental PRs to keep review burden low
What changes are included in this PR?
Are these changes tested?
Yes by CI
Are there any user-facing changes?
No, just internal code motion