Benefits To Federating The Hadoop NameNode

Hanisha Koneru and Arpit Agarwal show us a few benefits to NameNode federation:

The Apache Hadoop Distributed File System (HDFS) is highly scalable and can support petabyte-sizes clusters.  However, the entire Namespace (file system metadata) is stored in memory. So even though the storage can be scaled horizontally, the namespace can only be scaled vertically. It is limited by the how many files, blocks and directories can be stored in the memory of a single NameNode process.

Federation was introduced in order to scale the name service horizontally by using multiple independent Namenodes/ Namespaces. The Namenodes are independent of each other and there is no communication between them. The Namenodes can share the same Datanodes for storage.

KEY BENEFITS

Scalability: Federation adds support for horizontal scaling of Namespace

Performance: Adding more Namenodes to a cluster increases the aggregate read/write throughput of the cluster

Isolation: Users and applications can be divided between the Namenodes

Read on for examples.

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