In Hadoop, a znode is a data node in the ZooKeeper service that is used to store configuration information and coordinate distributed processes in the Hadoop cluster. ZooKeeper is a centralized service that provides a hierarchical namespace and coordination services for distributed systems.
In the context of MapReduce, znodes are used to store information about the job’s progress, such as the status of the job and the task attempts. This information can be used to monitor the progress of the job and to recover from failures. Znodes are important for ensuring the reliability and fault tolerance of Hadoop and MapReduce systems, as they allow for coordination and synchronization of distributed processes across the cluster.
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