Xiaogang Shi created FLINK-5397:
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Summary: Fail to deserialize savepoints in v1.1 when there exist
missing fields in class serialization descriptors
Key: FLINK-5397
URL: https://issues.apache.org/jira/browse/FLINK-5397
Project: Flink
Issue Type: Bug
Components: State Backends, Checkpointing
Reporter: Xiaogang Shi
To restore from the savepoints in previous versions, Flink now keeps all
classes whose serialization is changed and put them in a separated package
("migration").
When deserializing the old savepoints, flink will look up correct descriptors
({{ObjectStreamClass}}) for these classes, without using those ones written in
serialized data. The implementation however is problematic when there exist
missing field descriptors in the serialized data.
When deserializing an object, Java will only write the descriptors of those
non-null fields. But when we look up class descriptors with given classes, all
fields will be put into the descriptors. As a result, we will deserialize the
savepoints with incorrect descriptors, leading to serialization exceptions.
A simple resolution is to update the name of read descriptors using
Reflections, without using a different descriptors.
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