FrontPage - Lucene-hadoop Wiki: "Hadoop DFS
Hadoop's Distributed File System is designed to reliably store very large files across machines in a large cluster. It is inspired by the [WWW] Google File System. Hadoop DFS stores each file as a sequence of blocks, all blocks in a file except the last block are the same size. Blocks belonging to a file are replicated for fault tolerance. The block size and replication factor are configurable per file. Files in HDFS are 'write once' and have strictly one writer at any time."
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