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From: "Ming Ma (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-9005) Provide support for upgrade domain
 script
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Ming Ma created HDFS-9005:
-----------------------------

             Summary: 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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