The average salary of all instructors in institutions offering graduate degrees was $71,121 per year, as of the 2010-11 academic year, according to the American Association of University Professors.
ZooKeeper is an open source Apacheâ¢ project that provides a centralized infrastructure and services that enable synchronization across a cluster. ZooKeeper maintains common objects needed in large cluster environments.
The common services provided by ZooKeeper are as follows 1  â. Naming service â Identifying the nodes in a cluster by name. It is similar to DNS, but for nodes. 2  Configuration management â Latest and up-to-date configuration information of the system for a joining node.