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https://issues.apache.org/jira/browse/HDFS-16871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang resolved HDFS-16871.
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Fix Version/s: 3.4.0
Resolution: Fixed
> DiskBalancer process may throws IllegalArgumentException when the target
> DataNode has capital letter in hostname
> ----------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-16871
> URL: https://issues.apache.org/jira/browse/HDFS-16871
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Daniel Ma
> Assignee: Daniel Ma
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Attachments: screenshot-1.png, screenshot-2.png
>
>
> DiskBalancer process read DataNode hostname as lowercase letters,
> !screenshot-1.png!
> but there is no letter case transform when getNodeByName.
> !screenshot-2.png!
> For a DataNode with lowercase hostname. everything is ok.
> But for a DataNode with uppercase hostname, when Balancer process try to
> migrate on it, there will be a IllegalArgumentException thrown as below,
> {code:java}
> 2022-10-09 16:15:26,631 ERROR tools.DiskBalancerCLI:
> java.lang.IllegalArgumentException: Unable to find the specified node.
> node-group-1YlRf0002
> {code}
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