Github user shixiaogang commented on a diff in the pull request:
https://github.com/apache/flink/pull/3531#discussion_r107646429
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/StateAssignmentOperation.java
---
@@ -306,6 +307,29 @@ private static void
assignTaskStatesToOperatorInstances(
}
/**
+ * Determine the subset of {@link KeyGroupsStateHandle
KeyGroupsStateHandles} with correct
+ * key group index for the given subtask {@link KeyGroupRange}.
+ * <p>
+ * <p>This is publicly visible to be used in tests.
+ */
+ public static List<KeyedStateHandle> getKeyedStateHandles(
+ Collection<? extends KeyedStateHandle>
keyedStateHandles,
+ KeyGroupRange subtaskKeyGroupRange) {
+
+ List<KeyedStateHandle> subtaskKeyedStateHandles = new
ArrayList<>();
+
+ for (KeyedStateHandle keyedStateHandle : keyedStateHandles) {
+ KeyGroupRange intersection =
keyedStateHandle.getKeyGroupRange().getIntersection(subtaskKeyGroupRange);
--- End diff --
The idea is great! It does make sense to allow a `KeyedStateHandle` to
create a new `KeyedStateHandle` to the states of the sub range. I will update
the PR as suggested.
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