Github user StefanRRichter commented on a diff in the pull request:
https://github.com/apache/flink/pull/3925#discussion_r116977867
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/heap/HeapKeyedStateBackend.java
---
@@ -385,6 +386,19 @@ private void
restorePartitionedState(Collection<KeyedStateHandle> state) throws
serializationProxy.read(inView);
+ // check for key serializer compatibility; this
also reconfigures the
+ // key serializer to be compatible, if it is
required and is possible
+ if
(StateMigrationUtil.resolveCompatibilityResult(
+
serializationProxy.getKeySerializer(),
+
TypeSerializerSerializationProxy.ClassNotFoundDummyTypeSerializer.class,
+
serializationProxy.getKeySerializerConfigSnapshot(),
+ (TypeSerializer) keySerializer)
+ .isRequiresMigration()) {
+
+ throw new RuntimeException("The new key
serializer is not compatible to read previous keys. " +
--- End diff --
Same here.
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