Implement key collection and deletion in FIFO #2310
Conversation
Collect and delete keys that are less than or equal to the requested index. Removing key/values pairs in a bucket during iteration on the bucket using cursor may not work properly. Each time when removing a key/value pair, the cursor may automatically move to the next position if present. When users call c.Next() after removing a key, it may skip one key/value pair. Refer to etcd-io/bbolt#611 for more detailed info.
![gemini-code-assist[bot]](https://avatars.githubusercontent.com/in/956858?s=60&v=4){kind=small}
There was a problem hiding this comment.
Summary of Changes
Hello @otoolep, 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!
This pull request addresses a critical bug in the FIFO queue's key deletion mechanism. Previously, deleting keys directly during a cursor iteration could cause the cursor to advance unexpectedly, leading to some keys being inadvertently skipped. The changes introduce a robust two-step process: first, all keys targeted for deletion are identified and collected, and then, these collected keys are individually removed. This ensures that all intended keys are reliably deleted without interference from cursor movements.
Highlights
- Corrected Key Deletion Logic: Implemented a two-phase approach for deleting keys in the FIFO queue, first collecting all keys to be deleted and then performing the deletions. This resolves an issue where direct deletion during cursor iteration could lead to keys being skipped.
- Cursor Iteration Safety: Ensured safe key deletion by copying key slices (
k) before storing them, as the original slices are only valid within the transaction, preventing potential data corruption or unexpected behavior.
Using Gemini Code Assist
The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.
Invoking Gemini
You can request assistance from Gemini at any point in your pull request via creating an issue comment (i.e. comment on the pull request page) using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands.
| Feature | Command | Description |
|---|---|---|
| Code Review | /gemini review |
Performs a code review for the current pull request in its current state. |
| Pull Request Summary | /gemini summary |
Provides a summary of the current pull request in its current state. |
| Comment | @gemini-code-assist | Responds in comments when explicitly tagged, both in issue comments and review comments. |
| Help | /gemini help |
Displays a list of available commands. |
Customization
To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.
Limitations & Feedback
Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here.
You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.
Footnotes
-
Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩
There was a problem hiding this comment.
Code Review
This pull request correctly addresses a bug in bbolt where deleting items while iterating with a cursor can lead to skipping elements. The implemented solution of collecting keys before deletion is the proper fix. My review includes a suggestion to optimize the memory usage of this new logic, which can be particularly beneficial when deleting a large number of keys.
Collect and delete keys that are less than or equal to the requested index.
Removing key/values pairs in a bucket during iteration on the bucket using cursor may not work properly. Each time when removing a key/value pair, the cursor may automatically move to the next position if present. When users call c.Next() after removing a key, it may skip one key/value pair. Refer to etcd-io/bbolt#611 for more detailed info.