{"type":"post","id":"translations-at-scale-memory-optimization-techniques-that-kept-92ffbb","slug":"translations-at-scale-memory-optimization-techniques-that-kept-92ffbb","title":"Translations at Scale: Memory Optimization Techniques That Kept Uber's P99 Under 1ms","description":"Uber’s case shows that reducing garbage-collection overhead and reducing the resident data set are separate optimization problems.","retrieval_nugget":"Uber’s case shows that reducing garbage-collection overhead and reducing the resident data set are separate optimization problems.","published_at":"2026-10-17","updated_at":"2026-10-17","record_date":"2026-10-17","date_kind":"published_at","topics":["memory"],"source_urls":["https://www.uber.com/us/en/blog/translations-at-scale"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:translations-at-scale-memory-optimization-techniques-that-kept-92ffbb","status":"published","visuals":[],"editorial_provenance":{"schema_version":"newruntime-editorial-copy-v1","content_status":"source_grounded_final","final_copy_sha256":"sha256:e4ad27da8ce861795ddf055297db70c7df81af375e6d5c15431d18c85e4a7695","reviewed_at":"2026-10-17T00:02:40.550Z","source_evidence_count":1,"verified_claim_count":2,"site_analysis_schema_version":"newruntime-site-analysis-v1","site_object_kind":"field_note","observed_fact_count":2,"implication_count":1,"watch_condition_count":1,"related_record_count":0},"analysis":{"schema_version":"newruntime-site-analysis-v1","object_kind":"field_note","thesis":"Uber’s case shows that reducing garbage-collection overhead and reducing the resident data set are separate optimization problems.","observed_facts":[{"text":"Uber says replacing sync.Map with a map guarded by an RWMutex reduced CPU usage by more than 30% for the service discussed.","source_urls":["https://www.uber.com/us/en/blog/translations-at-scale"]},{"text":"In the example, memory fell from about 2.7 GB to 750 MB and the cache hit ratio exceeded 99.9%.","source_urls":["https://www.uber.com/us/en/blog/translations-at-scale"]}],"mechanism":"The service kept compact hash-based metadata and hot entries in memory while placing other translation values on disk, using sharding, eviction, and selective preloading to manage contention and latency.","why_now":"Why now: memory and garbage collection remain production costs even when the application’s core data is simple key-value content.","implications":["The implication is that cache design should be evaluated against both allocation pressure and the resident working set, not just lookup speed."],"evidence_boundary":"The evidence boundary is Uber’s own workload and reported measurements; the post does not provide independent validation or a general benchmark across services.","watch_conditions":["Watch whether the disk-backed design preserves latency and hit rate as translation usage and repository size grow."],"related_records":[],"new_branch_reason":"No prior New Runtime record was supplied for this specific translation-service memory optimization case."},"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/translations-at-scale-memory-optimization-techniques-that-kept-92ffbb/","markdown":"https://newruntime.com/posts/translations-at-scale-memory-optimization-techniques-that-kept-92ffbb.md","json":"https://newruntime.com/posts/translations-at-scale-memory-optimization-techniques-that-kept-92ffbb.json"},"next_reads":[{"type":"topic","path":"/topics/memory/","url":"https://newruntime.com/topics/memory/","title":"Memory","reason":"Explore the memory topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/memory.md","json_url":"https://newruntime.com/topics/memory.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}