Mapr - Warden
Table of Contents
About
Warden is a light Java application that runs on all the nodes in a cluster and coordinates cluster services.
Warden’s job on each node is to:
- start,
- stop,
- or restart
the appropriate services, and allocate the correct amount of memory to them.
Warden makes extensive use of the znode abstraction (ZooKeeper) to monitor the state of cluster services.