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HDFS — system plików Hadoop
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HDFS - Hadoop File System
default settings - file 128 mb. The file into parts/blocks to a minimum 3 nodes (data nodes). When server goes down, HDFS gets data/replicate from another node
HDFS — Hadoop — nazwa węzła
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HDFS - Hadoop - Name Node
the server responsible for storing our metadata. Returns data.
HDFS — rozproszony system plików Hadoop
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HDFS - Hadoop Distributed File System
Założenia map_reduce
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Map reduce - assumptions:
- designed for huge amounts of data - allows for distributed fault-tolerant data processing - works in three steps: map, combine, reduce
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