Github user kaibozhou commented on the issue:
https://github.com/apache/flink/pull/4355
In MapViewSerializer.scala, the function "override def serialize(record:
MapView[K, V], target: DataOutputView):" need to access var map which defined
in MapView.scala. Becase mapSerializer.serialize(record.map, target) only
accept java.util.Map, otherwise, we need to new java.util.Map to call this
method, this is not very efficient.
The problem is âprivate[flink] var mapâ will be seen by Java users, In
fact, we do not want users to see the implementation of MapView internal.
Maybe use "protected" keyword in Java can solve the problem.
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