[Workspace] Add REST store and fluent workspace APIs by mprahl · Pull Request #19449 · mlflow/mlflow

mprahl · 2025-12-17T03:04:14Z

🛠 DevTools 🛠

Install mlflow from this PR

# mlflow
pip install git+https://github.com/mlflow/mlflow.git@refs/pull/19449/merge
# mlflow-skinny
pip install git+https://github.com/mlflow/mlflow.git@refs/pull/19449/merge#subdirectory=libs/skinny

For Databricks, use the following command:

%sh curl -LsSf https://raw.githubusercontent.com/mlflow/mlflow/HEAD/dev/install-skinny.sh | sh -s pull/19449/merge

Related Issues/PRs

#1464
#5844
Design document: https://docs.google.com/document/d/1IbFfceCmWV3knJfc0ninn58EXLVbHUh1meV_pknOM40/edit

What changes are proposed in this pull request?

This adds workspace support to the tracking and model registry REST stores. It also adds the workspace related fluent APIs, and addresses some of the optional feedback from #19319.

How is this PR tested?

Existing unit/integration tests
New unit/integration tests
Manual tests

Does this PR require documentation update?

Release Notes

Is this a user-facing change?

No. You can skip the rest of this section.
Yes. Give a description of this change to be included in the release notes for MLflow users.

What component(s), interfaces, languages, and integrations does this PR affect?

Components

How should the PR be classified in the release notes? Choose one:

rn/none - No description will be included. The PR will be mentioned only by the PR number in the "Small Bugfixes and Documentation Updates" section
rn/breaking-change - The PR will be mentioned in the "Breaking Changes" section
rn/feature - A new user-facing feature worth mentioning in the release notes
rn/bug-fix - A user-facing bug fix worth mentioning in the release notes
rn/documentation - A user-facing documentation change worth mentioning in the release notes

Should this PR be included in the next patch release?

Yes should be selected for bug fixes, documentation updates, and other small changes. No should be selected for new features and larger changes. If you're unsure about the release classification of this PR, leave this unchecked to let the maintainers decide.

What is a minor/patch release?

Minor release: a release that increments the second part of the version number (e.g., 1.2.0 -> 1.3.0).
Bug fixes, doc updates and new features usually go into minor releases.
Patch release: a release that increments the third part of the version number (e.g., 1.2.0 -> 1.2.1).
Bug fixes and doc updates usually go into patch releases.

Yes (this PR will be cherry-picked and included in the next patch release)
No (this PR will be included in the next minor release)

Tracking and model registry REST stores now detect if the server has workspaces enabled if a user specifies a workspace. When a workspace is set and the servers support it, the REST store passes an X-MLFLOW-WORKSPACE header to the HTTP request. Signed-off-by: mprahl <mprahl@users.noreply.github.com>

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

mprahl · 2025-12-17T03:07:29Z

/cc @B-Step62 @BenWilson2

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

B-Step62

Overall looks good, left a few small comments

B-Step62 · 2025-12-18T14:10:48Z

mlflow/server/handlers.py

        _verify_model_registry_store_workspace_support(registry_store)


+def _store_supports_workspaces(store: object) -> bool:


Suggested change

def _store_supports_workspaces(store: object) -> bool:

def _store_supports_workspaces(store: AbstractStore) -> bool:

B-Step62 · 2025-12-18T14:13:56Z

mlflow/store/workspace_rest_store_mixin.py

+        self._workspace_support = supported
+        return supported
+
+    def _enforce_workspace_support(self) -> None:


Suggested change

def _enforce_workspace_support(self) -> None:

def _validate_workspace_support_if_specified(self) -> None:

nit: enforce sounds like it has some side effect.

B-Step62 · 2025-12-18T14:17:00Z

mlflow/tracking/_workspace/fluent.py

+        raise
+
+
+@experimental(version="3.8.0")


Suggested change

@experimental(version="3.8.0")

@experimental(version="3.9.0")

3.8.0 was just cut last week

B-Step62 · 2025-12-18T14:18:29Z

mlflow/tracking/_workspace/fluent.py

+        if exc.error_code == databricks_pb2.ErrorCode.Name(databricks_pb2.ENDPOINT_NOT_FOUND):
+            raise MlflowException(
+                "The configured tracking server does not expose workspace APIs. "
+                "Ensure multi-tenancy is enabled.",


Suggested change

"Ensure multi-tenancy is enabled.",

"Ensure workspace is enabled.",

Let's avoid the term 'multi-tenancy' as discussed offline.

github-actions · 2025-12-18T14:30:47Z

Documentation preview for 53875b5 is available at:

https://pr-19449--mlflow-docs-preview.netlify.app/docs/latest/

More info

Ignore this comment if this PR does not change the documentation.
The preview is updated when a new commit is pushed to this PR.
This comment was created by this workflow run.
The documentation was built by this workflow run.

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

mprahl added 2 commits December 16, 2025 21:15

Add fluent APIs for workspaces

c1c217f

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

github-actions bot added area/model-registry Model registry, model registry APIs, and the fluent client calls for model registry area/tracking Tracking service, tracking client APIs, autologging rn/none List under Small Changes in Changelogs. labels Dec 17, 2025

Address optional feedback from PR 19319

c81773f

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

mprahl force-pushed the rest-store branch from 0734b89 to c81773f Compare December 17, 2025 03:13

B-Step62 reviewed Dec 18, 2025

View reviewed changes

B-Step62 approved these changes Dec 18, 2025

View reviewed changes

github-actions bot assigned B-Step62 Dec 18, 2025

Address PR feedback

53875b5

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

mprahl force-pushed the rest-store branch from b71c203 to 53875b5 Compare December 18, 2025 21:08

mprahl requested a review from B-Step62 December 18, 2025 22:10

B-Step62 merged commit dbb043b into mlflow:orgnization-support Dec 20, 2025
47 checks passed

mprahl added a commit to mprahl/mlflow that referenced this pull request Jan 16, 2026

[Workspace] Add REST store and fluent workspace APIs (mlflow#19449)

f69fb72

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

B-Step62 pushed a commit to B-Step62/mlflow that referenced this pull request Jan 19, 2026

[Workspace] Add REST store and fluent workspace APIs (mlflow#19449)

0a58564

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

B-Step62 pushed a commit to B-Step62/mlflow that referenced this pull request Feb 3, 2026

[Workspace] Add REST store and fluent workspace APIs (mlflow#19449)

870323a

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

mprahl added a commit to mprahl/mlflow that referenced this pull request Feb 3, 2026

[Workspace] Add REST store and fluent workspace APIs (mlflow#19449)

59b98c6

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

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[Workspace] Add REST store and fluent workspace APIs#19449

[Workspace] Add REST store and fluent workspace APIs#19449
B-Step62 merged 4 commits intomlflow:orgnization-supportfrom
mprahl:rest-store

mprahl commented Dec 17, 2025 •

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		_verify_model_registry_store_workspace_support(registry_store)


		def _store_supports_workspaces(store: object) -> bool:

	def _store_supports_workspaces(store: object) -> bool:
	def _store_supports_workspaces(store: AbstractStore) -> bool:

	def _enforce_workspace_support(self) -> None:
	def _validate_workspace_support_if_specified(self) -> None:

	@experimental(version="3.8.0")
	@experimental(version="3.9.0")

	"Ensure multi-tenancy is enabled.",
	"Ensure workspace is enabled.",

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mprahl commented Dec 17, 2025 • edited by github-actions bot Loading Uh oh! There was an error while loading. Please reload this page.

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Install mlflow from this PR

Related Issues/PRs

What changes are proposed in this pull request?

How is this PR tested?

Does this PR require documentation update?

Release Notes

Is this a user-facing change?

What component(s), interfaces, languages, and integrations does this PR affect?

How should the PR be classified in the release notes? Choose one:

Should this PR be included in the next patch release?

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mprahl commented Dec 17, 2025

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mprahl commented Dec 17, 2025 •

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