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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