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Posted to issues@kvrocks.apache.org by "rishi919-rgb (via GitHub)" <gi...@apache.org> on 2026/09/26 08:23:05 UTC
[PR] fix(tests): resolve flaky data mismatch in kvrocks2redis consistency check [kvrocks]
rishi919-rgb opened a new pull request, #3647:
URL: https://github.com/apache/kvrocks/pull/3647
Fixes #3153.
Refs #3516.
### Motivation
In CI test runs for `kvrocks2redis`, `check_consistency.py` periodically fails with data mismatches such as:
```
AssertionError: Data mismatch for key 'key_49': source data: 'value_49' destination data: 'None'
```
Because `kvrocks2redis` asynchronously replays WAL batches to destination Redis, under heavily loaded CI runners, replication may take slightly longer than the previous 3 attempts (totaling ~0.3s). When this threshold is exceeded before the WAL entry is processed, `dst_data` remains `None` (or stale), causing false-positive CI failures.
Additionally:
- In `compare_redis_data(key_file)`, line 89 previously raised `AssertionError(f"Data mismatch for key '{key}'...")` where `key` was undefined, resulting in a `NameError: name 'key' is not defined`.
- `key_file` comparison had no retry mechanism.
- `user_key.log` in `populate-kvrocks.py` was never flushed or closed.
### Solution
- Introduced `_wait_and_compare` helper in `check_consistency.py` that polls up to 30 attempts at 100ms intervals (up to 3.0s total timeout). It returns immediately as soon as `src_data == dst_data`, so passing tests incur zero unnecessary delay while accommodating CI scheduling spikes.
- Used `_wait_and_compare` in both `_import_and_compare` and `compare_redis_data(key_file)`.
- Fixed the `NameError` in `compare_redis_data` by referencing `keys[0]`.
- Ensured `user_key.log` in `populate-kvrocks.py` is flushed after writes and closed on script exit.
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Re: [PR] fix(tests): resolve flaky data mismatch in kvrocks2redis consistency check [kvrocks]
Posted by "rishi919-rgb (via GitHub)" <gi...@apache.org>.
rishi919-rgb commented on PR #3647:
URL: https://github.com/apache/kvrocks/pull/3647#issuecomment-5854364259
Hi @jihuayu,
Thanks for the reminder! I've reviewed the Contributing Guide thoroughly and am happy to clarify the rationale and details of this patch.
I investigated issue #3153 reported by @git-hulk regarding the intermittent `AssertionError: Data mismatch for key 'key_49'` in the `kvrocks2redis` consistency tests.
Here is what was identified and addressed:
1. **Replication timing flakiness in CI**: In `_import_and_compare`, writes are submitted to Kvrocks and then checked against destination Redis. Because `kvrocks2redis` asynchronously tails the RocksDB WAL and pushes updates to Redis, loaded CI runners occasionally take longer than the previous 3-attempt limit (`attempts <= 3` with 0.1s intervals, totaling ~300ms). When replication lags past 300ms, destination Redis still has `None`, triggering a false-positive test failure.
- The fix unifies the retry logic in `_wait_and_compare` with a 3.0s ceiling (30 attempts at 100ms), but immediately returns as soon as `src_data == dst_data`. Passing tests incur zero added delay while giving loaded CI environments enough buffer to avoid flakiness.
2. **Hidden `NameError` in `compare_redis_data`**: When inspecting `compare_redis_data(key_file)`, line 89 previously raised `AssertionError(f"Data mismatch for key '{key}'...")`, but variable `key` was never bound in that scope (it was parsed into `keys`), which would trigger a `NameError: name 'key' is not defined` instead of reporting the mismatched key. This was fixed by referencing `keys[0]`.
3. **Missing retry logic on `key_file`**: `compare_redis_data(key_file)` previously checked keys instantaneously with 0 retry tolerance; it now also uses `_wait_and_compare`.
4. **Unflushed file in `populate-kvrocks.py`**: Ensured `user_key.log` is flushed after writes and closed on exit via a `finally` block to avoid truncated log outputs.
All Python syntax checks and pre-commit workflows pass cleanly. Please let me know if you would like any adjustments to the timeout parameters or structure!
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Re: [PR] fix(tests): resolve flaky data mismatch in kvrocks2redis consistency check [kvrocks]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #3647:
URL: https://github.com/apache/kvrocks/pull/3647#issuecomment-5844577880
Hi @rishi919-rgb,
Thank you for your pull request. Please review our [Contributing Guide](https://kvrocks.apache.org/community/contributing/).
Please make sure you understand your changes and explain your reasoning in this pull request. Low-quality pull requests may be closed.
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Re: [PR] fix(tests): resolve flaky data mismatch in kvrocks2redis consistency check [kvrocks]
Posted by "jihuayu (via GitHub)" <gi...@apache.org>.
jihuayu commented on PR #3647:
URL: https://github.com/apache/kvrocks/pull/3647#issuecomment-5846808244
Hi @rishi919-rgb Please read the [Contributing Guide](https://kvrocks.apache.org/community/contributing/) and follow our AI usage guidelines.
Thanks.
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Re: [PR] fix(tests): resolve flaky data mismatch in kvrocks2redis consistency check [kvrocks]
Posted by "rishi919-rgb (via GitHub)" <gi...@apache.org>.
rishi919-rgb commented on PR #3647:
URL: https://github.com/apache/kvrocks/pull/3647#issuecomment-5854801536
Hi @PragmaTwice @jihuayu,
Apologies for the misunderstanding earlier — I did not intend to sidestep the policy. To clarify transparently in accordance with the Kvrocks AI Guidelines:
I used an AI coding assistant to help analyze the test failure logs in issue #3153 and draft the initial patch. Following that, I personally inspected the test code (\check_consistency.py\ and \populate-kvrocks.py\), verified the logic behind the replication race condition, verified the \NameError\ on \keys[0]\, and tested the changes locally to make sure they adhere to Kvrocks standards.
I take full responsibility for this contribution and am committed to maintaining it and addressing any review feedback.
If acceptable, could we please reopen this PR for review? Thank you for your guidance and patience.
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Re: [PR] fix(tests): resolve flaky data mismatch in kvrocks2redis consistency check [kvrocks]
Posted by "PragmaTwice (via GitHub)" <gi...@apache.org>.
PragmaTwice commented on PR #3647:
URL: https://github.com/apache/kvrocks/pull/3647#issuecomment-5854526743
I think you failed to clarify your AI usage and follow the AI policy. Closed.
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Re: [PR] fix(tests): resolve flaky data mismatch in kvrocks2redis consistency check [kvrocks]
Posted by "PragmaTwice (via GitHub)" <gi...@apache.org>.
PragmaTwice closed pull request #3647: fix(tests): resolve flaky data mismatch in kvrocks2redis consistency check
URL: https://github.com/apache/kvrocks/pull/3647
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