[jira] [Created] (FLINK-3370) Add an aligned version of the window operator

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-3370:
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             Summary: Add an aligned version of the window operator
                 Key: FLINK-3370
                 URL: https://issues.apache.org/jira/browse/FLINK-3370
             Project: Flink
          Issue Type: Improvement
          Components: Windowing Operators
    Affects Versions: 1.0.0
            Reporter: Stephan Ewen


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




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