Github user StefanRRichter commented on a diff in the pull request: https://github.com/apache/flink/pull/3925#discussion_r116977261 --- Diff: flink-contrib/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBKeyedStateBackend.java --- @@ -1228,6 +1243,19 @@ private RocksDBIncrementalRestoreOperation(RocksDBKeyedStateBackend<?> stateBack DataInputView in = new DataInputViewStreamWrapper(inputStream); serializationProxy.read(in); + // 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) stateBackend.keySerializer) + .isRequiresMigration()) { + + throw new RuntimeException("The new key serializer is not compatible to read previous keys. " + + "Aborting now since state migration is currently not available"); --- End diff -- Same here.
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---