Atlas API : Create Trait Type Traits are Atlas types that act like decorators to provide a mechanism for classification. Traits can be applied to any Atlas entities (instances of classes). An entity can have any number of traits. For example, a SECURITY_CLEARANCE trait could be defined with an attribute ‘security_level’. An Atlas entity (e.g. an instance of Person class) could be tagged with the SECURITY_CLEARANCE trait by providing a value for the trait’s ‘security_level’ attribute. In order to use a trait, you first need to define the trait type. You can do that by posting to the Types resource of the Atlas REST APIs. Types Resource A type is the description of any representable item. In this case we are creating a trait type but the same resource is used to represent enums, structs and classes as well. /types POST Submits a types definition containing a type definition representing a trait. Request Body Types Definition application/json Response Body Types Response application/json Types Definition Properties enumTypes : Array of Type Definition for ENUM types structTypes : Array of Type Definition for STRUCT types traitTypes : Array of Type Definition for TRAIT types classTypes : Array of Type Definition for CLASS types Type Definition Properties superTypes : Array of super type names. hierarchicalMetaTypeName : String : The trait class name. typeName : String : The type name. attributeDefinitions : Array of Attribute Definition. Attribute Definition Properties name : String : The attribute name. dataTypeName : String : The owning data type name. multiplicity : String : OPTIONAL, REQUIRED, COLLECTION, SET isComposite : Boolean : True if the attribute’s lifecycle is dependent on the enclosing type and is not just a reference. isUnique : Boolean : True if the attribute must be unique. isIndexable : Boolean : True if the attribute can be indexed. reverseAttributeName : String : If this is a reference attribute, then the name of the attribute on the Class that this refers to. Types Response Properties requestId : String : The unique id for the request. types : Array of Type Name Definition. Type Name Definition Properties name : String : The type name. Example The following example creates an Atlas trait type called EXPIRES_ON that has a single attribute called ‘expiry_date’. POST http://c6401.ambari.apache.org:21000/api/atlas/types Body { "enumTypes": [], "structTypes": [], "traitTypes": [ { "superTypes":[], "hierarchicalMetaTypeName": "org.apache.atlas.typesystem.types.TraitType", "typeName": "EXPIRES_ON", "attributeDefinitions": [ { "name": "expiry_date", "dataTypeName": "date", "multiplicity": "required", "isComposite": false, "isUnique": false, "isIndexable": true, "reverseAttributeName": null } ] } ], "classTypes": [] } Response { requestId:"qtp1796488937-14 - 1a194816-1c6f-451a-b706-6dc2f53139e5" types:{ name:"EXPIRES_ON" } } ... View more