What is the NameNode?
The NameNode is the centerpiece of an HDFS file system. It keeps the directory tree of all files in the file system, and tracks where across the cluster the file data is kept. … The NameNode responds the successful requests by returning a list of relevant DataNode servers where the data lives.
What are the 2 main components of YARN?
It has two parts: a pluggable scheduler and an ApplicationManager that manages user jobs on the cluster. The second component is the per-node NodeManager (NM), which manages users’ jobs and workflow on a given node.
What is the role of a NameNode?
The NameNode is the centerpiece of an HDFS file system. It keeps the directory tree of all files in the file system, and tracks where across the cluster the file data is kept. … When the NameNode goes down, the file system goes offline.
What is DataNode Hadoop?
DataNodes store data in a Hadoop cluster and is the name of the daemon that manages the data. File data is replicated on multiple DataNodes for reliability and so that localized computation can be executed near the data.
What is full form of HDFS?
Hadoop Distributed File System (HDFS for short) is the primary data storage system under Hadoop applications. It is a distributed file system and provides high-throughput access to application data. It’s part of the big data landscape and provides a way to manage large amounts of structured and unstructured data.
What are the characteristics of YARN?
Yarn properties such as unevenness, hairiness, friction, roughness, shape, diameter, density, spinning technology and the raw material, and fabric properties such as fabric type and knitting structure, are the most important parameters that should be taken into consideration during the analysis of fabric surface …