Optimize Symfony http.route caching with path map approach

[cataphract]

Replace per-route caching with a single cached map of all route paths. This significantly improves performance and reduces memory usage.

Key improvements:

• Cache entire route map under single key '_datadog.symfony.route_paths'
• Store simple array: ['route_name' => '/path', ...]
• Smart invalidation based on compiled routes file mtime
• Cache indefinitely until Symfony recompiles routes or cache is invalidated
• Gracefully disable if cache.app unavailable

Cache invalidation logic:

• Checks {cache_dir}/url_generating_routes.php modification time
• Compares against cached timestamp (created at cache build time)
• Rebuilds cache only when compiled routes file is newer

Description

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[datadog-official]

⚠️ Tests

✨ Fix all issues with BitsAI or with Cursor

⚠️ Warnings

🧪 1028 Tests failed

testSearchPhpBinaries from integration.DDTrace\Tests\Integration\PHPInstallerTest (Datadog) (Fix with Cursor)

Risky Test
phpvfscomposer://tests/vendor/phpunit/phpunit/phpunit:52

testSimplePushAndProcess from laravel-58-test.DDTrace\Tests\Integrations\Laravel\V5_8\QueueTest (Datadog) (Fix with Cursor)

DDTrace\Tests\Integrations\Laravel\V5_8\QueueTest::testSimplePushAndProcess
Test code or tested code printed unexpected output: spanLinksTraceId: 699f0cf9000000001209c190fb17d8b9
tid: 699f0cf900000000
hexProcessTraceId: 1209c190fb17d8b9
hexProcessSpanId: 9338991605e3bfc1
processTraceId: 1299782795905194169
processSpanId: 10608397242138345409

phpvfscomposer://tests/vendor/phpunit/phpunit/phpunit:106

testSimplePushAndProcess from laravel-8x-test.DDTrace\Tests\Integrations\Laravel\V8_x\QueueTest (Datadog) (Fix with Cursor)

DDTrace\Tests\Integrations\Laravel\V8_x\QueueTest::testSimplePushAndProcess
Test code or tested code printed unexpected output: spanLinksTraceId: 699eff5300000000b963b2def3d3a2e2
tid: 699eff5300000000
hexProcessTraceId: b963b2def3d3a2e2
hexProcessSpanId: 3c2d9a28c15782a1
processTraceId: 13358717590354240226
processSpanId: 4336291516060762785

View all

ℹ️ Info

❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: cab8ccb | Docs | Datadog PR Page | Was this helpful? Give us feedback!}

[pr-commenter]

Benchmarks [ tracer ]

Benchmark execution time: 2026-02-25 14:59:24

Comparing candidate commit cab8ccb in PR branch glopes/symfony-routes-redux with baseline commit 07b618a in branch master.

Found 2 performance improvements and 2 performance regressions! Performance is the same for 189 metrics, 1 unstable metrics.

scenario:MessagePackSerializationBench/benchMessagePackSerialization

• 🟩 execution_time [-7.025µs; -3.215µs] or [-6.416%; -2.936%]

scenario:MessagePackSerializationBench/benchMessagePackSerialization-opcache

• 🟩 execution_time [-8.577µs; -6.943µs] or [-7.741%; -6.266%]

scenario:PDOBench/benchPDOOverhead

• 🟥 execution_time [+6.454µs; +10.633µs] or [+2.926%; +4.820%]

scenario:PDOBench/benchPDOOverheadWithDBM

• 🟥 execution_time [+7.532µs; +12.507µs] or [+3.437%; +5.707%]