Till Rohrmann created FLINK-944:
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Summary: Serialization problem of CollectionInputFormat
Key: FLINK-944
URL: https://issues.apache.org/jira/browse/FLINK-944
Project: Flink
Issue Type: Bug
Reporter: Till Rohrmann
Assignee: Till Rohrmann
The CollectionInputFormat uses only the standard serialization means provided
by the JVM. Thus data types which are serializable with a TypeSerializer but
does not implement the Serializable interface cannot be used with a
CollectionDataSource. Even worse, if one uses an aggregation type such as a
tuple, only the top level object will be checked for serializability.
Consequently, it will crash at runtime.
It would be more user friendly to not enforce that a used data type has to
implement the Serializable interface. Instead we should use the generated
TypeSerializer to do the serialization. That way, we are more flexible.
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