Complete info about it can be read here. In this way, what is a mapper class?
The Mapper class is a generic type, with four formal parameter types that specify the input key, input value, output key and output value types of the map function.
Additionally, how does Model Mapper work? How It Works. ModelMapper consists of two separate processes: the matching process, where a source and destination type's properties are matched to each other, and the mapping process where matched property values are converted from a source to destination object.
In respect to this, what is the use of Mapper?
Mapper is a function which process the input data. The mapper processes the data and creates several small chunks of data. The input to the mapper function is in the form of (key, value) pairs, even though the input to a MapReduce program is a file or directory (which is stored in the HDFS).
Why do we use dto in Java?
DTO was mainly used to get data transported across the network efficiently, it may be even from JVM to another JVM. DTOs are often java. io. Serializable - in order to transfer data across JVM.
