Remove unused Puma cluster mode configuration#2454
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mroderick merged 2 commits intocodebar:masterfrom Feb 2, 2026
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This removes the preload_app! directive and on_worker_boot block from config/puma.rb. These cluster-mode features are not used since the application runs in single-process mode (no workers configured). VERIFICATION THAT CLUSTER MODE IS NOT USED: 1. No 'workers' setting in config/puma.rb - cluster mode requires explicitly setting 'workers N' where N > 0. Without this, Puma runs in single-process mode by default. 2. No WEB_CONCURRENCY environment variable - searched entire codebase, no references found. This is Heroku's standard variable for controlling worker count. 3. Procfile uses standard single-process command: 'bundle exec puma -C config/puma.rb' with no worker-related flags. 4. No environment-specific Puma configs - only config/puma.rb exists, no production/staging overrides. 5. Environment configs (development/production/test.rb) have no Puma worker configuration. 6. The Puma 7.2.0 warning itself confirms the on_worker_boot block "will not execute in the current Puma configuration." IMPACT: - No behavior change - this code was never executing - Removes warning introduced in Puma 7.x about unused callbacks - Prepares for Puma 8.0 where on_worker_boot will be removed entirely - If cluster mode is needed in future, these are standard patterns that can be easily restored Related to codebar#2447
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Summary
Removes the
preload_app!directive andon_worker_bootblock fromconfig/puma.rb. These cluster-mode features are not used since the application runs in single-process mode across all environments.This change:
on_worker_bootwill be removed entirelyVerification
Confirmed cluster mode is not in use:
workerssetting in config/puma.rb (required for cluster mode)WEB_CONCURRENCYenvironment variable in codebaseRelated
Test Plan