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https://issues.apache.org/jira/browse/HDFS-9005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14735500#comment-14735500
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Ming Ma commented on HDFS-9005:
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Thanks [~cmccabe]. We could use XML or other file format. The script approach
could allow admins to regularly add machines to the cluster without any
additional operation to update NN with upgrade domain of these new machines. If
we use the XML approach, we will need additional steps to keep NN up to date
such as a) use the script to generate updated XML file for the new machines. b)
have NN reload the XML file before it reloads dfs.hosts file. Sure these steps
can be automated. It is just somewhat easier for admins to use the script.
> 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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