[FLINK-3370] Add an aligned version of the window operator

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Abandoned
• Affects Version/s: 1.0.0
• Component/s: API / DataStream
• Labels: stale-assigned
• Assignee: Unassigned
• Reporter: Stephan Ewen
• Created: 08/Feb/16 16:15
• Updated: 17/Apr/21 12:02
• Resolved: 17/Apr/21 12:02

Description

The windowing operators currently follow a generic implementation for support of unaligned windows.

We can gain efficiency by creating a variant that is optimized for aligned windows:

• Aligned windows can use aligned triggers, which keep no per-key state
• Less trigger state means less checkpointing data
• Based on the aligned windows, we can create sliding event time windows that do not replicate data into the different overlapping windows

Issue Links

• is duplicated by: FLINK-3581 Add Special Aligned Event-Time WindowOperator

Sub-Tasks

• Move TriggerCotext and TriggerResult to their own classes: Closed