{Core} Use multi-threading to build command index to improve performance#32730
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DanielMicrosoft merged 5 commits intoAzure:devfrom Feb 11, 2026
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Pull request overview
This PR updates the core command-loading pipeline to load command modules in parallel, aiming to reduce command index rebuild time while preserving command table semantics.
Changes:
- Introduces a threaded module-loading mechanism in
MainCommandsLoader(azure.cli.core.__init__), along withModuleLoadResult, timeout/worker-count configuration, and refactored error-handling and telemetry for module load failures. - Refactors
_load_command_loader/_load_module_command_loader/_load_extension_command_loaderinazure.cli.core.commands.__init__to return thecommand_loaderobject in addition to command and group tables, moving population ofloadersandcmd_to_loader_mapintoMainCommandsLoader. - Adds and updates tests to validate command table integrity, command-to-loader mapping after parallel loading, and to make existing expectations order-insensitive.
Reviewed changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
src/azure-cli-core/azure/cli/core/__init__.py |
Adds threaded module loading (_load_modules, _load_single_module) and ModuleLoadResult, refactors load_command_table to use pre-loaded results, maintains cmd_to_loader_map and command_source, and introduces timeout/worker-count constants and top-level completion helpers. |
src/azure-cli-core/azure/cli/core/commands/__init__.py |
Changes _load_command_loader and wrappers to return (command_table, group_table, command_loader), deferring loaders/cmd_to_loader_map updates to MainCommandsLoader. |
src/azure-cli-core/azure/cli/core/tests/test_command_registration.py |
Updates the mocked _load_command_loader to the new 3-tuple signature, adds test_cmd_to_loader_map_populated_after_parallel_loading, and relaxes some assertions to be order-insensitive to accommodate parallel loading. |
src/azure-cli-core/azure/cli/core/tests/test_parser.py |
Updates the local _mock_load_command_loader used for parser tests to return the new 3-tuple, keeping it consistent with the refactored core loader API. |
src/azure-cli-core/azure/cli/core/tests/test_command_table_integrity.py |
Adds a new end-to-end test verifying there are no duplicate commands, core command groups exist, every command has a command_source, and that command and group tables are non-empty after loading via the new pipeline. |
In addition to the inline comment already recorded, note that changing _load_command_loader to return a 3-tuple will break any remaining callers that still unpack only two values (for example, test_help.mock_load_command_loader currently does module_command_table, module_group_table = mock_load_command_loader(...)), so those sites need to be updated to handle the new (command_table, group_table, command_loader) contract.
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necusjz
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Feb 6, 2026
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Feb 6, 2026
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Feb 9, 2026
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Related command
Description
Version 2 of the previously reverted attempt to thread module loading, when building the command index:
#32518
More info on situations that trigger a build here.
A look at the speed improvements from the changes in this PR here.
Testing Guide
History Notes
[Component Name 1] BREAKING CHANGE:
az command a: Make some customer-facing breaking change[Component Name 2]
az command b: Add some customer-facing featureThis checklist is used to make sure that common guidelines for a pull request are followed.
The PR title and description has followed the guideline in Submitting Pull Requests.
I adhere to the Command Guidelines.
I adhere to the Error Handling Guidelines.