Hadoop Spark architecture, complex diagram, 3D illustration, futuristic blue glow, metallic structures, circuits, wires, servers, nodes, clusters, HDFS blocks, YARN containers, Spark executors, Resilient Distributed Datasets, directed acyclic graph, workflow scheduling, in-memory processing, batch processing, real-time data processing, big data analytics, cloud computing, data center, racks, cables, LED lights, futuristic ambiance, high-tech composition, sharp lines, neon lights, 3/4 angle view.