Atlas client: Delete entity by unique attribute

AtlasClientV2#deleteEntityByAttribute method is used to delete an entity by unique attribute search.

 

Example

Map<String, String> uniqAttributes = new HashMap<>();
uniqAttributes.put("qualifiedName", "DeleteEntityByUniqueAttribute_DEMO1");
EntityMutationResponse entityMutationResponse = atlasClient.deleteEntityByAttribute(TYPE_NAME, uniqAttributes);

 

Find the below working application.

 

Create atlas-application.properties file under src/main/resources folder.

 

atlas-application.properties

 

atlas.client.readTimeoutMSecs=30000
atlas.client.connectTimeoutMSecs=30000

 

Define DeleteEntityByUniqueAttribute class.

 

DeleteEntityByUniqueAttribute.java

 

package com.sample.app.entity;

import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.atlas.AtlasClientV2;
import org.apache.atlas.AtlasServiceException;
import org.apache.atlas.model.instance.AtlasEntity;
import org.apache.atlas.model.instance.AtlasEntityHeader;
import org.apache.atlas.model.instance.EntityMutationResponse;
import org.apache.atlas.model.typedef.AtlasEntityDef;
import org.apache.atlas.model.typedef.AtlasStructDef.AtlasAttributeDef;
import org.apache.atlas.model.typedef.AtlasTypesDef;

public class DeleteEntityByUniqueAttribute {

	private static final String TYPE_NAME = "DemoType20";

	private static void createType(AtlasClientV2 atlasClient) throws AtlasServiceException {
		AtlasAttributeDef attributeDef1 = new AtlasAttributeDef();
		attributeDef1.setName("a");
		attributeDef1.setTypeName("int");
		attributeDef1.setCardinality(AtlasAttributeDef.Cardinality.SINGLE);
		attributeDef1.setIsIndexable(true);
		attributeDef1.setIsUnique(false);

		AtlasAttributeDef attributeDef2 = new AtlasAttributeDef();
		attributeDef2.setName("b");
		attributeDef2.setTypeName("int");
		attributeDef2.setCardinality(AtlasAttributeDef.Cardinality.SINGLE);
		attributeDef2.setIsIndexable(true);
		attributeDef2.setIsUnique(false);

		AtlasEntityDef atlasEntityDef = new AtlasEntityDef();
		atlasEntityDef.setName(TYPE_NAME);
		atlasEntityDef.setCreatedBy("Krishna");
		atlasEntityDef.setUpdatedBy("krishna");
		atlasEntityDef.setDescription("Represent a laptoo specification");
		atlasEntityDef.setAttributeDefs(Arrays.asList(attributeDef1, attributeDef2));

		Set<String> superTypes = new HashSet<>();
		superTypes.add("DataSet");
		atlasEntityDef.setSuperTypes(superTypes);

		AtlasTypesDef atlasTypesDef = new AtlasTypesDef();

		atlasTypesDef.getEntityDefs().add(atlasEntityDef);

		atlasClient.createAtlasTypeDefs(atlasTypesDef);
	}

	private static String createEntity(AtlasClientV2 atlasClient) throws AtlasServiceException {

		AtlasEntity atlasEntity = new AtlasEntity();

		atlasEntity.setTypeName(TYPE_NAME);

		atlasEntity.setAttribute("a", 10);
		atlasEntity.setAttribute("b", 20);

		// Following are the mandatory attributes
		atlasEntity.setAttribute("qualifiedName", "DeleteEntityByUniqueAttribute_DEMO1");
		atlasEntity.setAttribute("name", "DeleteEntityByUniqueAttribute_DEMO1");

		AtlasEntity.AtlasEntityWithExtInfo atlasEntityWithExtInfo = new AtlasEntity.AtlasEntityWithExtInfo();
		atlasEntityWithExtInfo.setEntity(atlasEntity);

		EntityMutationResponse entityMutationResponse = atlasClient.createEntity(atlasEntityWithExtInfo);
		return entityMutationResponse.getCreatedEntities().get(0).getGuid();
	}

	public static void main(String[] args) throws AtlasServiceException {

		AtlasClientV2 atlasClient = new AtlasClientV2(new String[] { "http://localhost:21000" },
				new String[] { "admin", "admin" });

		createType(atlasClient);
		createEntity(atlasClient);

		Map<String, String> uniqAttributes = new HashMap<>();
		uniqAttributes.put("qualifiedName", "DeleteEntityByUniqueAttribute_DEMO1");

		System.out.println("Deleting the entity by unique attirbute... ");
		EntityMutationResponse entityMutationResponse = atlasClient.deleteEntityByAttribute(TYPE_NAME, uniqAttributes);
		
		System.out.println("Deleted Item is ");
		List<AtlasEntityHeader> deletedEntities = entityMutationResponse.getDeletedEntities();
		for(AtlasEntityHeader header: deletedEntities) {
			System.out.println(header.getAttributes().get("name"));
		}

	}
}

 

Run above application.

 

Go to Atlas UI and query for the type ‘DemoType20’ and select the check box ‘Show historical entities’ to see soft deleted entities.

 

 

 

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