The Apache big data suite (Hadoop/Spark/Yarn/Hive/HDFS/etc).
In several years of big data engineering work, I've believe I've seen only one application that couldn't be refactored into a simple multi-instance framework-free program. People use the big data frameworks as glorified distributed-job management tools, and the resulting systems are more fragile, more complex, more vulnerable to weird version compatibility errors, and less efficient.
In several years of big data engineering work, I've believe I've seen only one application that couldn't be refactored into a simple multi-instance framework-free program. People use the big data frameworks as glorified distributed-job management tools, and the resulting systems are more fragile, more complex, more vulnerable to weird version compatibility errors, and less efficient.