gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/IoStep.java
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/process/computer/traversal/step/sideEffect/HadoopIoStep.java

gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/util/detached/DetachedVertex.java
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/structure/HadoopVertex.java

gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/util/empty/EmptyGraph.java
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/structure/HadoopGraph.java

gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/util/reference/ReferenceVertex.java
hadoop-gremlin/src/main/java/org/apache/tinkerpop/gremlin/hadoop/structure/HadoopVertex.java