Apache Flink

Apache Flink is ranked #6 of 21 in stream processing software on The Geeks Club. It runs on API, Linux, Self-hosted. There is a free plan.

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Apache Flink Free Open source under Apache License v2 flink.apache.org · 30 Sept 2026

Compared on stream processing software

Free plan: Yes
Stateful processing: Yes
Supported languages: Java, Python, Scala

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Apache Flink

What it does: Apache Flink is a framework and distributed processing engine for stateful computations over unbounded and bounded data streams.
Use cases: Flink supports event-driven applications, stream and batch analytics, and data pipelines and ETL.
Correctness: The site lists exactly-once state consistency, event-time processing, and sophisticated late-data handling as capabilities.
APIs: Its listed layered APIs include SQL on stream and batch data, the DataStream API, and ProcessFunction for time and state.
Operations: The site lists flexible deployment, high-availability setup, savepoints, scale-out architecture, support for very large state, and incremental checkpoints.
Performance: The site lists low latency, high throughput, and in-memory computing as performance capabilities.
Integrations: Separately released connectors listed on the downloads page include AWS, Cassandra, Elasticsearch, Google Cloud PubSub, HBase, Hive, JDBC, Kafka, MongoDB, OpenSearch, Prometheus, Pulsar, and RabbitMQ.
Deployment options: Flink is designed to run in common cluster environments, and the site identifies the Kubernetes Operator as the standard deployment mechanism for Flink on Kubernetes.
Security boundary: Flink trusts the cluster operator and authenticated job submitters; submitted code runs with the operating system permissions available to it, so Flink is not a sandbox.
Security configuration: SSL/TLS, REST API authentication, and SQL Gateway authentication are disabled by default and must be configured for production or shared deployments.
Known vulnerabilities: The project does not maintain its own CVE list and directs users to the Apache Security database for Flink CVEs.
Community support: The project lists its user mailing list as a support channel and also points users to Slack and Stack Overflow.
Support limitation: A user needs to subscribe to a mailing list before posting, and Jira requires an ASF JIRA account to log issues.
License and maintainer: The site states that its content is under Apache License v2 and identifies the Apache Software Foundation as the trademark holder.
Price from: Free

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Where it ranks on The Geeks Club

Best Stream Processing Software in 2026#6 of 21
Best Streaming Analytics Software in 2026#6 of 19

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Sources

flink.apache.org· checked 30 Sept 2026
flink.apache.org/downloads/· checked 30 Sept 2026
flink.apache.org/what-is-flink/security/· checked 30 Sept 2026
flink.apache.org/what-is-flink/community/· checked 30 Sept 2026