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Limitations of diskless topics

Diskless topics are compatible with Kafka APIs and clients, with some limitations:

  • Transactions are not supported for produce or consume operations.
  • Compacted topics are not supported.
  • Kafka Streams state stores are not supported. Stream processing can read from diskless topics but must write to classic topics.
  • Classic and tiered Kafka topics cannot be converted to diskless topics.

Aiven-managed PostgreSQL® service upgrades​

Aiven monitors the PostgreSQL® service that supports diskless topics in Bring Your Own Cloud (BYOC) deployments. This Aiven-managed service stores metadata used by the Batch Coordinator, such as offsets and batch locations. When the service experiences high load, Aiven upgrades its plan to maintain performance and stability.

  • The upgrade does not cause downtime.
  • You receive an email notification when the upgrade occurs.
  • The upgraded plan appears in your billing and usage metrics.
  • No action is required.

For details about the Batch Coordinator and metadata, see Architecture.