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What is a block in Hadoop HDFS? What should be the block size to get optimum performance from the Hadoop cluster?
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Answer / Shantanu Shukla
A block is the smallest unit of data storage in HDFS. Each file in HDFS is divided into multiple blocks, and each block is replicated across multiple DataNodes for fault tolerance. The optimal block size depends on several factors, such as the size of the data, network bandwidth, and disk capacity. A common practice is to set the block size between 64MB and 128MB.
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