Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/4353#discussion_r133016663
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/OperatorSubtaskState.java
---
@@ -75,31 +103,79 @@
*/
private final long stateSize;
+ @VisibleForTesting
+ public OperatorSubtaskState(StreamStateHandle legacyOperatorState) {
+
+ this(legacyOperatorState,
+ Collections.<OperatorStateHandle>emptyList(),
+ Collections.<OperatorStateHandle>emptyList(),
+ Collections.<KeyedStateHandle>emptyList(),
+ Collections.<KeyedStateHandle>emptyList());
+ }
+
+ /**
+ * Empty state.
+ */
+ public OperatorSubtaskState() {
--- End diff --
Minor optimization: One could make this constructor `private` and have a
field `OperatorSubtaskState.EMPTY` as a placeholder for the empty states. I'd
leave this to you whether you think it worth doing...
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