Github user tweise commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/187#discussion_r48981018
--- Diff: api/src/main/java/com/datatorrent/api/Operator.java ---
@@ -224,6 +224,7 @@ public String toString()
* Operators must implement this interface if they are interested in
being notified as
* soon as the operator state is checkpointed or committed.
*
+ * @deprecated Use {@link CheckpointNotificationListener} instead
--- End diff --
We added an additional method and had to introduce the new interface
instead of modifying the existing one for backward compatibility.
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