[HDFS-16871] DiskBalancer process may throws IllegalArgumentException when the target DataNode has capital letter in hostname

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: datanode
• Labels: pull-request-available
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Daniel Ma
• Reporter: Daniel Ma
• Created: 19/Dec/22 08:29
• Updated: 28/Jan/24 07:33
• Resolved: 20/Dec/22 23:13

Description

DiskBalancer process read DataNode hostname as lowercase letters,

but there is no letter case transform when getNodeByName.

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,

2022-10-09 16:15:26,631 ERROR tools.DiskBalancerCLI: java.lang.IllegalArgumentException: Unable to find the specified node. node-group-1YlRf0002

Issue Links

• links to: GitHub Pull Request #5240