1. Standalone Mode:
Default mode of Hadoop, it uses local file stystem for input and output operations. This mode is mainly used for debugging purpose, and it does not support the use of HDFS. Further, in this mode, there is no custom configuration required for mapred-site.xml, core-site.xml, hdfs-site.xml files. Much faster when compared to other modes.
2. Pseudo-Distributed Mode (Single Node Cluster):
2. Pseudo-Distributed Mode (Single Node Cluster):
In this case, you need configuration for all the three files mentioned above. In this case, all daemons are running on one node and thus, both Master and Slave node are the same.
3. Fully Distributed Mode (Multiple Cluster Node):
3. Fully Distributed Mode (Multiple Cluster Node):
This is the production phase of Hadoop (what Hadoop is known for) where data is used and distributed across several nodes on a Hadoop cluster. Separate nodes are allotted as Master and Slave.
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