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From "Bharat Viswanadham (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-12827) Need Clarity on Replica Placement: The First Baby Steps in HDFS Architecture documentation
Date Fri, 17 Nov 2017 02:22:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bharat Viswanadham resolved HDFS-12827.
---------------------------------------
    Resolution: Not A Problem
      Assignee: Bharat Viswanadham

> Need Clarity on 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
>            Assignee: Bharat Viswanadham
>            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.
> ############
> 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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