openworld-maker opened a new pull request, #4216:
URL: https://github.com/apache/solr/pull/4216
## Description
This PR addresses SOLR-18124 by adding tracing spans around UpdateLog
replay/recovery.
### What changed
- Added an overall replay span: `updatelog.replay`.
- Added a per-log child span: `updatelog.replay.log`.
- Added lightweight replay metadata on spans where already available:
- replay context (`state`, `active_log`, `in_sorted_order`)
- core name and db instance
- total/replayed log counts and replayed op counts
- per-log file name, size, replayed op count, error count, success flag
- URP chain summary
- Added error reporting to spans for replay exceptions.
- Added `UpdateLogReplayTracingTest` to verify:
- parent replay span exists
- per-log child span exists
- parent/child relationship is correct
- key replay metadata attributes are present
### Notes
- No intended functional change to UpdateLog replay behavior.
- Instrumentation follows existing Solr tracing conventions via `TraceUtils`.
### Testing
- Attempted: `./gradlew :solr:core:test --tests
org.apache.solr.update.UpdateLogReplayTracingTest`
- This environment does not have a Java runtime installed, so the test
command could not execute here.
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