Evidence-backed facts
- Apache Beam defines pipelines, PCollections, transforms, windowing, triggers, state, timers, schemas, and runner-portable execution concepts. informative
- A pipeline graph remains a definition until a selected runner executes it; IO writes, external calls, state, and runner jobs are separate effects. informative
- Runner credentials, project and cluster permissions, IO source and sink access, code artifacts, network policy, and resource quotas bound execution. informative
- Beam portability does not prove identical runner semantics, successful execution, exactly-once external effects, data quality, or a deployed job. informative