Github user greghogan commented on a diff in the pull request:
https://github.com/apache/flink/pull/4574#discussion_r139185112
--- Diff:
flink-core/src/main/java/org/apache/flink/api/java/typeutils/TypeExtractor.java
---
@@ -1900,7 +1900,8 @@ private boolean isValidPojoField(Field f, Class<?>
clazz, ArrayList<Type> typeHi
ParameterizedType parameterizedType,
TypeInformation<IN1> in1Type, TypeInformation<IN2> in2Type) {
if (!Modifier.isPublic(clazz.getModifiers())) {
- LOG.info("Class " + clazz.getName() + " is not public,
cannot treat it as a POJO type. Will be handled as GenericType");
+ LOG.info("Class " + clazz.getName() + " is not public,
cannot treat it as a POJO type. " +
+ "Will be handled as GenericType, and may lose
some serialization performance.");
--- End diff --
What if we said something like "... is not public and cannot be processed
as a POJO type. Please read the Flink documentation on "Data Types &
Serialization" for details on the impact to performance."
---
