rkhachatryan commented on a change in pull request #18391: URL: https://github.com/apache/flink/pull/18391#discussion_r803954550
########## File path: flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/metadata/MetadataV2V3SerializerBase.java ########## @@ -415,7 +440,7 @@ KeyedStateHandle deserializeKeyedStateHandle( int baseSize = dis.readInt(); List<KeyedStateHandle> base = new ArrayList<>(baseSize); for (int i = 0; i < baseSize; i++) { - base.add(deserializeKeyedStateHandle(dis, context)); + base.add(Preconditions.checkNotNull(deserializeKeyedStateHandle(dis, context))); Review comment: Maybe there is some misunderstanding, let me clarify what I mean: 1. `NULL_HANDLE = 0` - there is already an explicit constant that encodes null handles 2. I propose: ``` for (int i = 0; i < baseSize; i++) { KeyedStateHandle handle = deserializeKeyedStateHandle(dis, context); if (handle != null) { base.add(handle); } } ``` If you think throwing exception or logging here is more appropriate I'm also fine with this approach. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org