tillrohrmann commented on issue #6755: [FLINK-10412] toString field in AbstractID should be transient to avoid been serialized URL: https://github.com/apache/flink/pull/6755#issuecomment-431311897 As of this [documentation](https://docs.oracle.com/javase/8/docs/platform/serialization/spec/version.html#a6519), making a nontransient field transient is identical as removing a field from a class. What happens is that an earlier version won't find the field data in the serialized stream and will initialize the field with the default value (`null`). In general this is an incompatible change when relying on Java serialization, however in our case if `toString == null`, then we will simply regenerate the `toString` field when calling `toString`. Therefore, I think it is ok to merge this change. I will proceed with merging.
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