Fix scheduling problem in coordinator #1446
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Summary of Changes
Hello @hongyunyan, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
I've addressed a scheduling problem within the coordinator component, specifically rectifying an issue where an AddMaintainerOperator was incorrectly marking a changefeed replica as absent when the changefeed was being stopped and removed. My changes ensure that when an add operation is canceled due to the changefeed's removal, the replica's state is correctly handled, preventing erroneous absent markings.
Highlights
- Improved Cancellation State Management: I've updated the
AddMaintainerOperatorto use an integer-based enum (None,NodeRemoved,TaskRemoved) for itscanceledstatus, providing more granular tracking of why an operation was canceled. - Corrected Changefeed State Transition: I've modified the
PostFinishmethod ofAddMaintainerOperatorto prevent marking a maintainer asabsentif the cancellation was due to the changefeed (task) being removed, ensuring proper cleanup. - New Test Case for Interrupted Operations: I've added a comprehensive test to
operator_controller_test.goto simulate and validate the scenario where a changefeed is stopped and removed while anAddMaintainerOperatoris still in progress, confirming the fix.
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Code Review
This PR refines the cancellation logic for AddMaintainerOperator by introducing specific cancellation reasons (NodeRemoved, TaskRemoved). This allows PostFinish to correctly handle scenarios where an add operation is superseded by a stop/remove operation. The change from atomic.Bool to int for the canceled state requires careful synchronization. A new test case provides coverage for the fix.
| // AddMaintainerOperator is an operator to schedule a maintainer to a node | ||
| type AddMaintainerOperator struct { | ||
| cf *changefeed.Changefeed | ||
| dest node.ID | ||
| finished atomic.Bool | ||
| canceled atomic.Bool | ||
| canceled int | ||
| db *changefeed.ChangefeedDB |
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The canceled field has been changed from atomic.Bool to int. Ensure that all concurrent access paths to this field are properly managed, as this change could introduce a race condition if not handled carefully.
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/retest |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: asddongmen The full list of commands accepted by this bot can be found here. The pull request process is described here
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[LGTM Timeline notifier]Timeline:
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What problem does this PR solve?
Issue Number: close #1443
What is changed and how it works?
Check List
Tests
Questions
Will it cause performance regression or break compatibility?
Do you need to update user documentation, design documentation or monitoring documentation?
Release note