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https://issues.apache.org/jira/browse/HDFS-9005?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ming Ma updated HDFS-9005:
--------------------------
    Attachment: HDFS-9005.branch-2.8.001.patch

Per the discussion in the umbrella jira, we want to the feature to be in 2.8. 
Here is the patch for branch-2.8. It requires some manual effort. All HDFS 
tests passed locally.

> Provide configuration support for upgrade domain
> ------------------------------------------------
>
>                 Key: HDFS-9005
>                 URL: https://issues.apache.org/jira/browse/HDFS-9005
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>             Fix For: 2.9.0, 3.0.0-alpha1
>
>         Attachments: HDFS-9005-2.patch, HDFS-9005-3.patch, HDFS-9005-4.patch, 
> HDFS-9005.branch-2.8.001.patch, HDFS-9005.patch
>
>
> As part of the upgrade domain feature, we need to provide a mechanism to 
> specify upgrade domain for each datanode. One way to accomplish that is to 
> allow admins specify an upgrade domain script that takes DN ip or hostname as 
> input and return the upgrade domain. Then namenode will use it at run time to 
> set {{DatanodeInfo}}'s upgrade domain string. The configuration can be 
> something like:
> {noformat}
> <property>
> <name>dfs.namenode.upgrade.domain.script.file.name</name>
> <value>/etc/hadoop/conf/upgrade-domain.sh</value>
> </property>
> {noformat}
> just like topology script, 



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