Offload Blocking Work to a Vert.x Worker Verticle
Keep Vert.x event loops responsive by moving blocking I/O to a dedicated worker verticle pool.
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javaClustered Request-Reply on the Vert.x Event Bus
Use Vert.x event bus request-reply for intra-cluster verticle communication without dedicated HTTP endpoints, with caveats around durability and exactly-once delivery.
Run Blocking Code in Vert.x Without Stalling the Event Loop
Blocking the Vert.x event loop with JDBC or file I/O destroys throughput. Learn when to use worker verticles and how to size the worker pool.
Efficient Service Messaging in Vert.x: Request-Reply and Custom Codecs
Optimize Vert.x service-to-service communication using custom MessageCodecs and the request-reply pattern to send domain objects across a clustered event bus without blocking.
Vert.x 4.x Async Composition: Default to Future/Promise, Reserve RxJava3 and Mutiny
Decision guide for Vert.x 4.x services: default to built-in Future/Promise for async composition, reserving RxJava3 or Mutiny for backpressure needs. Includes implementation patterns and validation.
Diagnosing and Fixing Vert.x Event‑Loop Starvation
When a Vert.x event‑loop stalls, latency spikes, timeouts, and "Thread blocked for … ms" logs appear. This guide walks you through spotting the symptoms, running a step‑by‑step diagnosis, fixing common blocking patterns, and knowing when to raise the issue.
Vert.x Event Bus with JSON Codec: Architecture Note for Microservices
A custom JSON codec and worker verticles keep the Vert.x Event Bus responsive, but clustered delivery introduces silent failure modes and a hard 256 KB payload limit.
Vert.x Event Bus: Request-Response Without Blocking the Loop
A practical look at Vert.x Event Bus request-response messaging, including deployment, codec choices, and how to avoid freezing the event loop.
Custom Message Codecs in Vert.x: Solving the POJO Serialization Bottleneck
Vert.x Event Bus rejects arbitrary POJOs by default. Learn how custom message codecs restore type safety, what registration discipline they demand in a cluster, and how to verify the result.