[jira] [Created] (FLINK-4322) Unify CheckpointCoordinator and SavepointCoordinator

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-4322:
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             Summary: Unify CheckpointCoordinator and SavepointCoordinator
                 Key: FLINK-4322
                 URL: https://issues.apache.org/jira/browse/FLINK-4322
             Project: Flink
          Issue Type: Bug
          Components: State Backends, Checkpointing
    Affects Versions: 1.1.0
            Reporter: Stephan Ewen
             Fix For: 1.2.0


The Checkpoint coordinator should have the functionality of both handling checkpoints and savepoints.

The difference between checkpoints and savepoints is minimal:
  - savepoints always write the root metadata of the checkpoint
  - savepoints are always full (never incremental)

The commonalities are large
  - jobs should be able to resume from checkpoint or savepoints
  - jobs should fall back to the latest checkpoint or savepoint

This subsumes issue https://issues.apache.org/jira/browse/FLINK-3397



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