Learnings History

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2026-03-15

Created and pushed branch SOLR-18124-updatelog-replay-tracing; added tracing spans around UpdateLog replay, per-log spans, and metadata along with the UpdateLogReplayTracingTest verification.
Documented instrumentation details and test failures/mitigations in AGENTS.md for future readers.
Opened PR #4216 targeting SOLR-18124 and noted the need to rerun the new tracing tests before merge.

Resolved test setup issues in UpdateLogReplayTracingTest by wiring leader-distributed params, jsonAdd calls, and run metadata in isolation; test iterations now compile.
Installed Java 21 locally, set GRADLE_USER_HOME to avoid permission issues, and ran:
- ./gradlew :solr:core:test --tests org.apache.solr.update.UpdateLogReplayTracingTest
- ./gradlew :solr:core:test --tests org.apache.solr.update.PeerSyncWithBufferUpdatesTest both succeeded after the fix.
Pushed update to PR #4216 and left a comment summarizing the completed local checks.

Reintroduced an automated solr.security.allow.paths preload inside SolrTestCase.beforeSolrTestCase() so tests that reference ExternalPaths.SERVER_HOME no longer need to set the system property manually, and cleaned up the few remaining test files accordingly (including the RenameCoreAPITest formatting fix).
Verified RenameCoreAPITest again under Java 21 using ./gradlew :solr:core:test --tests org.apache.solr.handler.admin.api.RenameCoreAPITest (build succeeded).