Scaling Namespaces and Optimizing Data Storage
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Improving performance with centralized cache management

Centralized cache management enables you to specify paths to directories that are cached by HDFS, thereby improving performance for applications that repeatedly access the same data.

Centralized cache management in HDFS is an explicit caching mechanism. The NameNode communicates with DataNodes that have the required data blocks available on disk, and instructs the DataNodes to cache the blocks in off-heap caches.