Scaling Namespaces and Optimizing Data Storage
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Optimizing performance

You can consider the following options to optimize the performance of an HDFS cluster: swapping disk drives on a DataNode, caching data, configuring rack awareness, customizing HDFS, optimizing NameNode disk space with Hadoop archives, identifying slow DataNodes and improving them, optimizing small write operations by using DataNode memory as storage, and implementing short-circuit reads.