carp84 commented on a change in pull request #8570: [FLINK-11987] [state] Make
serializer lazy initialization thread safe in StateDescriptor
URL: https://github.com/apache/flink/pull/8570#discussion_r288909836
##########
File path:
flink-core/src/main/java/org/apache/flink/api/common/state/StateDescriptor.java
##########
@@ -82,8 +87,7 @@
/** The serializer for the type. May be eagerly initialized in the
constructor,
* or lazily once the {@link
#initializeSerializerUnlessSet(ExecutionConfig)} method
* is called. */
- @Nullable
- protected TypeSerializer<T> serializer;
+ private final AtomicReference<TypeSerializer<T>>
serializerAtomicReference = new AtomicReference<>();
Review comment:
Yes if we aim at making `StateDescriptor` thread safe but that would be a
bigger project and requires more testing.
Considering the seemingly fact that reset `queryableStateName` or
`ttlConfig` won't cause obvious trouble, does it make sense if we fix the
serializer lazy initialization issue (which has caused a NPE problem on kafka
producer) first and then check whether it worth another JIRA/PR for making the
whole `StateDescriptor` thread safe? Thanks.
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