This is for Hadoop eco system like HDFS, Map reduce, Hive, Hbase, Pig, sqoop,sqoop2, Avro, solr, hcatalog, impala, Oozie, Zoo Keeper and Hadoop distribution like Cloudera, Hortonwork etc.
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Unlike Namenode, a datanode actually stores data within the Hadoop distributed file system. Datanodes run on their own Java virtual machine.
A DataNode stores data in the [HadoopFileSystem]. A functional filesystem has more than one DataNode, with data replicated across them.
On startup, a DataNode connects to the NameNode; spinning until that service comes up. It then responds to requests from the NameNode for filesystem operations.
Client applications can talk directly to a DataNode, once the NameNode has provided the location of the data.
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