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HDFS divides files into blocks and stores each block on a DataNode. Multiple DataNodes are linked to the master node in the cluster, the NameNode. The master node distributes replicas of these data blocks across the cluster.
Namenode in HDFS The master node is the Namenode. Namenode is the master node that runs on a separate node in the cluster. Manages the filesystem namespace which is the filesystem tree or hierarchy of the files and directories. Stores information like owners of files, file permissions, etc for all the files.
Blocked data is normally stored in a data buffer, and read or written a whole block at a time.
DataNode. DataNode is the slave/worker node and holds the user data in the form of Data Blocks. There can be any number of DataNodes in a Hadoop Cluster.
If a data block is replicated, in which data node will it be replicated to? Is there any tool to show where the replicated blocks are present?
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