Mohammad Mustaqeem created HDFS-4664:
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             Summary: HDFS for heterogeneous environment
                 Key: HDFS-4664
                 URL: https://issues.apache.org/jira/browse/HDFS-4664
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: balancer
    Affects Versions: 0.20.2
         Environment: Ubuntu Linux, Institutional lab 
            Reporter: Mohammad Mustaqeem


I want to use HDFS for storing the files in the institutional labs.
Here the point is to be noted that all the nodes in the labs are not of same 
type that is some nodes stay on for longer duration while some for small 
duration.
In addition to this all the labs are not same means that some lab has UPS 
facility and some has more nodes.
If I consider the lab as rack, then we should not choose the racks and node 
randomly in replica placement.
We should give more priority to those nodes that stay on for longer duration 
and to those lab which has lab facility and has more system.

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