--- title: "How We Cut Kafka Consumer Deployment Costs by 83% · triva..." url: https://daily.dev/posts/how-we-cut-kafka-consumer-deployment-costs-by-83-triva--65gowghhb source_url: https://tech.trivago.com/post/2026-06-12-how-we-cut-kafka-consumer-deployment-costs-by-83 type: article source: "Tech at trivago" published: 2026-06-17T11:37:51.563Z updated: 2026-06-17T11:38:11.544Z tags: ["performance", "kafka", "grpc", "reactive-programming"] reading_time: 6 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # How We Cut Kafka Consumer Deployment Costs by 83% · triva... **[Tech at trivago](https://daily.dev/sources/trivago)** · 6 min read · 0 upvotes · 0 comments ## Summary A backend engineer at Trivago shares how they cut Kafka consumer deployment costs by 83% and resolved 19 P1 incidents by diagnosing a multi-layered performance problem in their PSE-kafka microservice. The root cause turned out to be three compounding issues: an in-house KafkaReceiverFlux that stopped calling poll() under load, a Mono.delayElement() ceiling tied to flatMap concurrency, and an undersized gRPC thread pool. Each fix in isolation had no measurable effect; only addressing all three together — migrating to reactor-kafka, removing the in-memory delay via an IsFinished flag, and tuning the gRPC thread pool — reduced pod count from 60 to 6, eliminated consumer lag, and cut pod startup time from ~60s to ~10s. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [From Always-On to On-Demand: Scaling Kafka Sinks with KED...](https://daily.dev/posts/from-always-on-to-on-demand-scaling-kafka-sinks-with-ked--vltl2g6wl) · Tech at trivago · 0 upvotes · 0 comments - [Scaling Java-Based Real-Time Systems: The Hidden Tradeoffs of Event-Driven Design](https://daily.dev/posts/scaling-java-based-real-time-systems-the-hidden-tradeoffs-of-event-driven-design-ef85inlwt) · InfoQ · 8 upvotes · 1 comments --- Tags: [#performance](https://daily.dev/tags/performance), [#kafka](https://daily.dev/tags/kafka), [#grpc](https://daily.dev/tags/grpc), [#reactive-programming](https://daily.dev/tags/reactive-programming) [View this post on daily.dev](https://daily.dev/posts/how-we-cut-kafka-consumer-deployment-costs-by-83-triva--65gowghhb)