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From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HDFS-9005) Provide support for upgrade domain
 script
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    [ https://issues.apache.org/jira/browse/HDFS-9005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14735356#comment-14735356 ] 

Colin Patrick McCabe commented on HDFS-9005:
--------------------------------------------

Hi [~mingma],

Why not use an XML file to set the upgrade domain for each DataNode instead of a script?  Spawning scripts has been awkward in the past since it's slow and they can fail.

> Provide support for upgrade domain script
> -----------------------------------------
>
>                 Key: HDFS-9005
>                 URL: https://issues.apache.org/jira/browse/HDFS-9005
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Ming Ma
>
> 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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