Github user StefanRRichter commented on a diff in the pull request:
https://github.com/apache/flink/pull/3005#discussion_r92402942
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/checkpoint/ListCheckpointed.java
---
@@ -41,6 +41,7 @@
* @param checkpointId The ID of the checkpoint.
* @param timestamp Timestamp of the checkpoint.
* @return The operator state in a list of redistributable, atomic
sub-states.
+ * Should not return null, but empty list instead.
--- End diff --
Oh, plus `null` is semantically indifferent from empy list in this case. So
for the sake of consistency, I give this advice in the doc.
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