HDFS - Application

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HDFS applications need a write-once-read-many access model for files. A file once created, written, and closed need not be changed except for appends and truncates. Appending the content to the end of the files is supported but cannot be updated at arbitrary point.

HDFS provides interfaces for applications to move themselves closer to where the data is located.





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HDFS - Block Replication

in HDFS HDFS stores each file as a sequence of blocks. The blocks of a file are replicated for fault tolerance. The NameNode makes all decisions regarding replication of blocks. It periodically receives...



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