[Protocol] Add a version checksum to the specification #3777
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prakharjain09
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Oct 24, 2024
prakharjain09
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Oct 24, 2024
vkorukanti
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<!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://github.com/delta-io/delta/blob/master/CONTRIBUTING.md 2. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP] Your PR title ...'. 3. Be sure to keep the PR description updated to reflect all changes. 4. Please write your PR title to summarize what this PR proposes. 5. If possible, provide a concise example to reproduce the issue for a faster review. 6. If applicable, include the corresponding issue number in the PR title and link it in the body. --> #### Which Delta project/connector is this regarding? <!-- Please add the component selected below to the beginning of the pull request title For example: [Spark] Title of my pull request --> - [X] Spark - [ ] Standalone - [ ] Flink - [ ] Kernel - [ ] Other (fill in here) ## Description <!-- - Describe what this PR changes. - Describe why we need the change. If this PR resolves an issue be sure to include "Resolves #XXX" to correctly link and close the issue upon merge. --> This PR adds a `ChecksumHook` which is responsible for a writing a checksum (See #3777) of the current table state after every commit. This is guarded behind a flag which is `false` by default. Currently, every checksum write will trigger a full state reconstruction, which can be very expensive. An upcoming PR will try to make this checksum computation incremental so that we don't have to pay a performance penalty. ## How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to test the changes thoroughly including negative and positive cases if possible. If the changes were tested in any way other than unit tests, please clarify how you tested step by step (ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future). If the changes were not tested, please explain why. --> Added a new suite --- ChecksumSuite. ## Does this PR introduce _any_ user-facing changes? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If possible, please also clarify if this is a user-facing change compared to the released Delta Lake versions or within the unreleased branches such as master. If no, write 'No'. --> No
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Which Delta project/connector is this regarding?
Description
Adds the concept of a Version Checksum to the protocol. This version checksum can be emitted on every commit and stores important bits of information about the snapshot which can later be used to validate the integrity of the delta log.
How was this patch tested?
N/A
Does this PR introduce any user-facing changes?
N/A