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According to Hortonworks

HDFS has demonstrated production scalability of up to 200 PB of storage and a single cluster of 4500 servers, supporting close to a billion files and blocks.

what does "blocks" mean in this post?

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Essentially yes but the size is very different. A hard drives default block size is 512 bytes but Hadoops default block size is 128 Megabytes.

Hadoop also replicates blocks to maintain integrity of the data.

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