[BEAM-23] User-facing state and timers for ParDo(DoFn)

• Type: New Feature
• Status: Resolved
• Priority: P2
• Resolution: Duplicate
• Fix Version/s: Not applicable
• Component/s: beam-model
• Labels: State
• Assignee: Kenneth Knowles
• Reporter: Kenneth Knowles
• Created: 19/Feb/16 21:34
• Updated: 24/Jul/20 20:55
• Resolved: 28/Nov/16 21:21

Description

To a key-partitioned ParDo, add the ability for a user's DoFn to, on a per-key-and-window basis:

• read and write consistent state
• set a timer to request a callback at a particular moment (in any time domain)

Issue Links

• contains: BEAM-25 Add user-ready API for interacting with state
• contains: BEAM-27 Add user-ready API for interacting with timers
• links to: GitHub Pull Request #1378
• links to: GitHub Pull Request #1556