Block replication on HDFS

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Information about Block replication on HDFS
Technology

Published on March 7, 2014

Author: kvanstrien

Source: slideshare.net

Description

The replication of data on a Hadoop node is explained in three slides.

Files are broken up in ‘blocks’ Log file a.txt Block 1 Essentials of Hadoop for Big Data Block 2 Log file b.txt Block 3 Block 4 1 Log file e.txt Block 5

Blocks are replicated (at least 3x) throughout the cluster on Data Nodes Block 5 Node 1 Node 2 Node 3 Node 4 Block 4 Block 3 Block 2 Block 1 Essentials of Hadoop for Big Data 2

Blocks are replicated (at least 3x) throughout the cluster on Data Nodes Block 5 Block 1 Block 2 Block 1 Essentials of Hadoop for Big Data Block 3 Block 1 Block 2 Block 4 Block 4 Block 3 Node 2 Node 1 Block 5 Block 4 Block 5 Block 1 Block 2 Block 3 Block 5 Node 3 Node 4 Block 2 Block 3 Block 4 3

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