MAP Dataslot type is a feature that can be used to store data which is in the form of key-value pair.
MAP Dataslot can store any object which implements java.util.Map and java.lang.Serializable interfaces. You can use implementation of java.util.Map available with standard distribution of java like, java.util.HashMap, java.util.LinkedHashMap, java.util.Hashtable, etcetera. You can also use custom implementation of java.util.Map interface.
By default, BP Server uses java.util.LinkedHashMap for MAP dataslot.