Make merge operator tool more robust #1462
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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 have analyzed the changes in this pull request, and my assessment is that it enhances the robustness of the operator management within the operator_controller. This is achieved by introducing explicit checks to prevent the addition of duplicate operators. This change ensures that the controller's state remains consistent and avoids potential issues arising from redundant or conflicting operator instances, ultimately contributing to a more stable and predictable system behavior.
Highlights
- Duplicate Operator Prevention: Introduced checks in the
AddMergeOperatorfunction to prevent the addition ofOccupyDispatcherOperatorinstances if an operator with the same ID already exists in the controller's internal map. This ensures that each operator is unique and prevents redundant processing. - Merge Operator Idempotency: Added a similar check for the
mergeOperatoritself, ensuring that amergeOperatoris not added if one with the same ID is already present. This improves the idempotency of the operator addition process within the controller. - Informative Logging for Duplicates: When a duplicate operator is detected and its addition is skipped, an informative log message is now emitted. This message includes details such as the role, changefeed, and operator string, aiding in debugging and understanding the controller's behavior.
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Code Review
The code changes introduce checks to pre 8000 vent adding duplicate operators. However, the checks are performed after the operators have already been pushed, which can lead to an inconsistent state if an operator is found to already exist. Consider checking for the operator's existence before pushing it.
| if _, ok := oc.operators[operator.ID()]; ok { | ||
| log.Info("add operator failed, operator already exists", | ||
| zap.String("role", oc.role), | ||
| zap.String("changefeed", oc.changefeedID.Name()), | ||
| zap.String("operator", operator.String())) | ||
| return nil | ||
| } |
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This check is performed after the operator has already been pushed to oc.operators. If the operator already exists, the function returns nil, but the operator remains in oc.operators, leading to an inconsistent state. Consider checking for the operator's existence before pushing it.
| if _, ok := oc.operators[operator.ID()]; ok { | |
| log.Info("add operator failed, operator already exists", | |
| zap.String("role", oc.role), | |
| zap.String("changefeed", oc.changefeedID.Name()), | |
| zap.String("operator", operator.String())) | |
| return nil | |
| } | |
| if _, ok := oc.operators[operator.ID()]; ok { | |
| log.Info("add operator failed, operator already exists", | |
| zap.String("role", oc.role), | |
| zap.String("changefeed", oc.changefeedID.Name()), | |
| zap.String("operator", operator.String())) | |
| return nil | |
| } | |
| oc.pushOperator(operator) |
| if _, ok := oc.operators[mergeOperator.ID()]; ok { | ||
| log.Info("add operator failed, operator already exists", | ||
| zap.String("role", oc.role), | ||
| zap.String("changefeed", oc.changefeedID.Name()), | ||
| zap.String("operator", mergeOperator.String())) | ||
| return nil | ||
| } |
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Similar to the previous check, this check is performed after the mergeOperator has already been pushed. If the operator already exists, the function returns nil, but the operator remains in oc.operators. Consider checking for the operator's existence before pushing it.
| if _, ok := oc.operators[mergeOperator.ID()]; ok { | |
| log.Info("add operator failed, operator already exists", | |
| zap.String("role", oc.role), | |
| zap.String("changefeed", oc.changefeedID.Name()), | |
| zap.String("operator", mergeOperator.String())) | |
| return nil | |
| } | |
| if _, ok := oc.operators[mergeOperator.ID()]; ok { | |
| log.Info("add operator failed, operator already exists", | |
| zap.String("role", oc.role), | |
| zap.String("changefeed", oc.changefeedID.Name()), | |
| zap.String("operator", mergeOperator.String())) | |
| return nil | |
| } | |
| oc.pushOperator(mergeOperator) |
|
[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: wk989898 The full list of commands accepted by this bot can be found here. The pull request process is described here
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What problem does this PR solve?
Issue Number: close #xxx
What is changed and how it works?
Check List
Tests
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Will it cause performance regression or break compatibility?
Do you need to update user documentation, design documentation or monitoring documentation?
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