Google Cloud Pub/Sub vs TIBCO Messaging Schema Repository for Apache Kafka

Google Cloud Pub/Sub is a cloud messaging service for asynchronous communication between services that produce messages and those that process them. It is intended for service-to-service use, including streaming analytics, data integration, middleware, and parallel task queues, rather than direct communication with end users or IoT clients. Communication typically has latency around 100 milliseconds. Synchronous cross-zone replication and per-message receipt tracking provide at-least-once delivery; Dataflow supports exactly-once processing of Pub/Sub streams. There are no shards or partitions, and provisioning scales automatically after quota is set. Message controls include seek and replay, dead letter topics, and attribute-based filtering. Pub/Sub offers fine-grained access controls, end-to-end encryption, and HIPAA compliance. It supports REST and gRPC APIs and client libraries for seven languages; API keys are not supported for authentication. The maximum message size is 10 MB. The free monthly tier is free for the first 10 GB of data per month. Pay-as-you-go is $40 a month beyond 10 GB, with throughput listed at $40 per TB and storage at $0.27 per GiB-month.

TIBCO Messaging Schema Repository for Apache Kafka is a REST service for registering and managing Apache Avro JSON schemas used by producer applications and consumer applications. It checks compatibility as schemas evolve and keeps schema versions available so applications can use the message format they need. Compatibility settings include backward, forward, and full policies, their transitive variants, and none; BACKWARD is the default. OAuth2 roles control REST operations by default, with restrictions configurable to the subject level. The repository provides OpenAPI documentation and interactive queries through Swagger UI, and Kafka clients and brokers can use it to manage Avro schemas. TIBCO Enterprise Message Service Kafka transports can also retrieve schemas for deserializing imported Kafka payloads. TIBCO FTL is required for storage. Version 2.0.0 has 64-bit Intel Linux packages and a 64-bit Intel macOS installer, though macOS x86-64 support is marked deprecated. The Community Edition is free for up to 100 application instances or 1,000 web/mobile instances in production, without TIBCO Support. Version 2.0.0 support ends April 30, 2027.