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What are the components of HDFS and YARN ?

components of HDFS and YARN

NameNode

  • NameNode is the master node for processing metadata information for data blocks within the HDFS.

DataNode/SlaveNode

  • DataNode is the node which acts as slave node to store the data, for processing and use by the NameNode.
  • In addition to serving the client requests, the NameNode executes either of two following roles –
    • CheckpointNode.
    • BackupNode.
components of HDFS and YARN

CheckpointNode

  • It runs on a different host from the NameNode

BackupNode

  • It is a read-only NameNode which contains file system metadata information excluding the block locations.
Components of HDFS

Components of YARN

ResourceManager

  • This component receives processing requests and accordingly allocates to respective NodeManagers depending on processing needs.

NodeManager

  • It executes tasks on each single Data Node.
Components of YARN
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