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The following table provides definitions for some of the terms that are used in this document.
Term | Definition |
NameNode | A separate server that holds metadata for every file that is stored on the DataNodes. On an PowerScale OneFS cluster, every node in the cluster acts as a NameNode. |
DataNode | The worker node of the cluster to which the HDFS data is written. On an PowerScale OneFS cluster, every node in the cluster acts as a DataNode |
HDFS | Hadoop Distributed File System. In an PowerScale OneFS cluster with Hadoop deployment, OneFS serves as the file system for Hadoop compute clients. |
NodeManager | Process that starts application processes and manages resources on the DataNodes. |
RM | ResourceManager. The resource management component of YARN. This initiates application startup and controls scheduling on the DataNodes of the cluster (one instance per cluster). |
ToR | Top of rack. |
ZK | ZooKeeper. A centralized service for maintaining configuration information, naming, and providing distributed synchronization and group services. |