Github user StephanEwen commented on a diff in the pull request: https://github.com/apache/flink/pull/895#discussion_r34261966 --- Diff: docs/apis/streaming_guide.md --- @@ -1300,6 +1300,9 @@ Another way of exposing user defined operator state for the Flink runtime for ch When the user defined function implements the `Checkpointed` interface, the `snapshotState(â¦)` and `restoreState(â¦)` methods will be executed to draw and restore function state. +In addition to that, user functions can also implement the `CheckpointNotifier` interface to receive notifications on completed checkpoints via the `notifyCheckpointComplete(long checkpointId)` method. +Note that there is no guarantee for the user function to receive a notification once the checkpoint is complete. --- End diff -- Let's write it like "Note that there is no guarantee for the user function to receive a notification if a failure happens between checkpoint completion and notification. The notifications should hence be treated in a way that notifications from later checkpoints can subsume missing notifications."
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