ATLAS-2560: Addresses relationship handling during import.

repository/src/main/java/org/apache/atlas/repository/store/graph/v1/EntityGraphMapper.java

@@ -695,6 +695,10 @@ public class EntityGraphMapper {
         }
 
         if (attributeVertex == null) {
+            if(context.isImport()) {
+                return null;
+            }
+
             throw new AtlasBaseException(AtlasErrorCode.INVALID_OBJECT_ID, (ctx.getValue() == null ? null : ctx.getValue().toString()));
         }
 
@@ -733,7 +737,7 @@ public class EntityGraphMapper {
 
                     // for import use the relationship guid provided
                     if (context.isImport()) {
-                        AtlasGraphUtilsV1.setProperty(ret, Constants.GUID_PROPERTY_KEY, getRelationshipGuid(ctx.getValue()));
+                        AtlasGraphUtilsV1.setProperty(ret, Constants.RELATIONSHIP_GUID_PROPERTY_KEY, getRelationshipGuid(ctx.getValue()));
                     }
 
                     // if relationship did not exist before and new relationship was created
@@ -869,16 +873,18 @@ public class EntityGraphMapper {
 
                 Object newEntry = mapCollectionElementsToVertex(arrCtx, context);
 
-                if (isReference && newEntry instanceof AtlasEdge && inverseRefAttribute != null) {
+                if (isReference && newEntry != null && newEntry instanceof AtlasEdge && inverseRefAttribute != null) {
                     // Update the inverse reference value.
                     AtlasEdge newEdge = (AtlasEdge) newEntry;
 
                     addInverseReference(inverseRefAttribute, newEdge, getRelationshipAttributes(ctx.getValue()));
                 }
 
+                if(newEntry != null) {
                     newElementsCreated.add(newEntry);
                 }
             }
+        }
 
         if (isReference) {
             List<AtlasEdge> additionalEdges = removeUnusedArrayEntries(attribute, (List) currentElements, (List) newElementsCreated, ctx.getReferringVertex());

repository/src/test/java/org/apache/atlas/repository/impexp/ImportServiceTest.java

@@ -202,8 +202,21 @@ public class ImportServiceTest {
         }
     }
 
-    @DataProvider(name = "relationship")
+    @DataProvider(name = "relationshipLineage")
     public static Object[][] getImportWithRelationships(ITestContext context) throws IOException {
+        return getZipSource("rel-lineage.zip");
+    }
+
+    @Test(dataProvider = "relationshipLineage")
+    public void importDB8(ZipSource zipSource) throws AtlasBaseException, IOException {
+        loadBaseModel();
+        loadHiveModel();
+        AtlasImportRequest request = getDefaultImportRequest();
+        runImportWithParameters(importService, request, zipSource);
+    }
+
+    @DataProvider(name = "relationship")
+    public static Object[][] getImportWithRelationshipsWithLineage(ITestContext context) throws IOException {
         return getZipSource("stocks-rel-2.zip");
     }