String getName() {
    return name;
  }
A StreamEdge connects the source {@link JobNode}s to the target {@link JobNode}s with a stream.
If it's a sink StreamEdge, the target JobNode is empty.
If it's a source StreamEdge, the source JobNode is empty.
samza-core/src/main/java/org/apache/samza/execution/StreamEdge.java