Hadoop and DevOps, both have a solid future. One thing that you must note that these two are not alternatives, thus, serve different purposes. Hadoop is a scalable and cost-effective alternative to the Big Data management packages. On the other hand, DevOps is a hoard of practices that unites the development and operation procedures to cut short the time of software development.
If you wish to learn more about DevOps, visit DevOps tutorial and DevOps Certification by Intellipaat.