Suri babu Nuthalapati created HDFS-12827:
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Summary: Update the description about Replica Placement: The First
Baby Steps in HDFS Architecture documentation
Key: HDFS-12827
URL: https://issues.apache.org/jira/browse/HDFS-12827
Project: Hadoop HDFS
Issue Type: Improvement
Components: documentation
Reporter: Suri babu Nuthalapati
Priority: Minor
The placement should be this:
https://hadoop.apache.org/docs/r1.2.1/hdfs_design.html
HDFS’s placement policy is to put one replica on one node in the local rack,
another on a node in a different (remote) rack, and the last on a different
node in the same remote rack.
Hadoop Definitive guide says the same and I have tested and saw the same
behavior as above.
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But the documentation in the versions after r2.5.2 it was mentioned as:
http://hadoop.apache.org/docs/r2.5.2/hadoop-project-dist/hadoop-hdfs/HdfsDesign.html
HDFS’s placement policy is to put one replica on one node in the local rack,
another on a different node in the local rack, and the last on a different node
in a different rack.
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