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GreptimeTeam / greptimedb

An Open-Source, Cloud-Native, Unified Time Series Database for Metrics, Events, and Logs with SQL/PromQL supported. Available on GreptimeCloud.
https://greptime.com/
Apache License 2.0
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feat: refine scan metrics logging #4296

Closed evenyag closed 1 week ago

evenyag commented 1 week ago

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

This PR fixes the scan cost metrics and changes the prepare cost metric. It also logs the elapsed time before the first poll.

Checklist

Summary by CodeRabbit

coderabbitai[bot] commented 1 week ago

Walkthrough

The primary change involves the removal of the prepare_scan_cost field from various scan-related structs and replacing its usage with query_start.elapsed(). This includes modifying the locations where scanning costs were previously calculated to use elapsed time directly. Logging updates also reflect these changes, ensuring scan durations are properly tracked and reported.

Changes

Files Change Summary
src/.../scan_region.rs Removed prepare_scan_cost field from StreamContext and eliminated its initialization.
src/.../seq_scan.rs Replaced prepare_scan_cost assignments with self.stream_ctx.query_start.elapsed(); added first_poll variable; updated logs.
src/.../unordered_scan.rs Same changes as in seq_scan.rs, including prepare_scan_cost to query_start.elapsed() replacement, added first_poll, and updated logs.
src/.../parquet/reader.rs Adjusted scan cost calculations; removed elapsed time capture in certain code branches, centralized it.

Poem

In quiet bytes where data streams flow,
Blossoms a change, so calm, so slow.
Away with old costs, elapsed time reigns,
The clock now whispers, progress remains.
Logs now sing in accurate song,
Scan anew, where timings belong.
🌟🐇✨

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codecov[bot] commented 1 week ago

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.01%. Comparing base (849e0b9) to head (a563c3c). Report is 5 commits behind head on main.

Additional details and impacted files ```diff @@ Coverage Diff @@ ## main #4296 +/- ## ========================================== - Coverage 85.31% 85.01% -0.30% ========================================== Files 1063 1066 +3 Lines 188345 188633 +288 ========================================== - Hits 160686 160367 -319 - Misses 27659 28266 +607 ```