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db-migrations-expand-contract: add a dedicated reproduction for the DDL-collision exception

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While writing the article, chapter 14's first failure mode (a concurrent statement
seeing "Table CUSTOMERS not found" while DROP COLUMN runs) was described from the
live load-generator run but had no dedicated, committed reproduction of its own -
CustomerService's own retry would silently absorb it if triggered through the
service layer. DdlCollisionExceptionTest reproduces it directly at the raw JDBC
level, and the chapter and README now link to its captured transcript.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_019Fb7vW8vLyLKngBc4R3huA
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asmhatre
2026-09-16 19:33:31 +00:00
co-authored by Claude Sonnet 5
parent e478eafda3
commit a875bea55a
4 changed files with 124 additions and 7 deletions
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db-migrations-expand-contract/README.md
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@@ -93,6 +93,7 @@ a transcript going stale fails the build. Files `11`–`13` come from the live
| [`11-live-deploy-sequence.txt`](docs/output/11-live-deploy-sequence.txt) | [`scripts/run-all.sh`](scripts/run-all.sh) |
| [`12-load-generator-summary.txt`](docs/output/12-load-generator-summary.txt) | [`LoadGenerator`](src/main/java/com/ankurm/expandcontract/loadgen/LoadGenerator.java), via `run-all.sh` |
| [`13-schema-diagnostics-timeline.txt`](docs/output/13-schema-diagnostics-timeline.txt) | [`SchemaDiagnosticsController`](src/main/java/com/ankurm/expandcontract/diag/SchemaDiagnosticsController.java), via `run-all.sh` |
| [`14-ddl-collision-exception.txt`](docs/output/14-ddl-collision-exception.txt) | [`DdlCollisionExceptionTest`](src/test/java/com/ankurm/expandcontract/DdlCollisionExceptionTest.java) |
| [`14-ddl-silent-data-loss.txt`](docs/output/14-ddl-silent-data-loss.txt) | [`DdlSilentDataLossTest`](src/test/java/com/ankurm/expandcontract/DdlSilentDataLossTest.java) |
## Findings worth the trip