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Add project-context.md for datastream-to-spanner#3902

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Add project-context.md for datastream-to-spanner#3902
aasthabharill wants to merge 5 commits into
GoogleCloudPlatform:mainfrom
aasthabharill:datastream-to-spanner-context

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b/521743991

@aasthabharill aasthabharill force-pushed the datastream-to-spanner-context branch from 610c543 to 5595f80 Compare June 9, 2026 12:11
@codecov

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.04%. Comparing base (3b2def5) to head (da5aded).
⚠️ Report is 68 commits behind head on main.

Additional details and impacted files
@@             Coverage Diff              @@
##               main    #3902      +/-   ##
============================================
+ Coverage     53.73%   62.04%   +8.30%     
+ Complexity     6743     2971    -3772     
============================================
  Files          1087      532     -555     
  Lines         66794    32141   -34653     
  Branches       7478     3515    -3963     
============================================
- Hits          35890    19941   -15949     
+ Misses        28477    11179   -17298     
+ Partials       2427     1021    -1406     
Components Coverage Δ
spanner-templates 80.43% <ø> (+7.59%) ⬆️
spanner-import-export ∅ <ø> (∅)
spanner-live-forward-migration 90.16% <ø> (+9.21%) ⬆️
spanner-live-reverse-replication 84.37% <ø> (+7.27%) ⬆️
spanner-bulk-migration 92.58% <ø> (+1.47%) ⬆️
gcs-spanner-dv 90.39% <ø> (+4.63%) ⬆️
see 657 files with indirect coverage changes
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@aasthabharill aasthabharill added the addition New feature or request label Jun 9, 2026
Comment thread v2/datastream-to-spanner/project-context.md Outdated
@aasthabharill aasthabharill requested a review from darshan-sj June 10, 2026 04:46
@aasthabharill aasthabharill marked this pull request as ready for review June 10, 2026 04:46
@aasthabharill aasthabharill requested a review from a team as a code owner June 10, 2026 04:46
@aasthabharill aasthabharill requested a review from sm745052 June 10, 2026 04:46
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Summary of Changes

Hello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces documentation and architectural diagrams for the datastream-to-spanner Dataflow template. The goal is to provide a centralized source of truth regarding the pipeline's design, technical constraints, and operational guidelines to assist future development and maintenance.

Highlights

  • Project Documentation: Added a comprehensive project-context.md file to provide AI agents and developers with architectural insights, coding standards, and best practices for the datastream-to-spanner template.
  • Architecture Visualization: Included an updated architecture diagram in both .dot and .svg formats to reflect the current data flow and component interactions.
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Code Review

This pull request adds comprehensive architectural documentation for the Datastream to Spanner Dataflow template, including a Graphviz DOT file, its corresponding SVG diagram, and a detailed project context markdown file. Feedback on the architecture diagram points out a misleading label 'Write To DLQ2' and suggests renaming it to 'Write To Severe DLQ' to correctly represent that severe errors are routed to a subdirectory of the main DLQ rather than a separate resource.

Comment thread v2/datastream-to-spanner/architecture.dot Outdated
Comment thread v2/datastream-to-spanner/project-context.md Outdated
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