[HDFS-16717] Replace NPE with IOException in DataNode.class

• Type: Improvement
• 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: ZanderXu
• Reporter: ZanderXu
• Created: 04/Aug/22 12:06
• Updated: 28/Jan/24 08:17
• Resolved: 23/Aug/22 10:19

Description

In current logic, if storage not yet initialized, it will throw a NPE in DataNode.class. Developers or SREs are very sensitive to NPE, so I feel that we can use IOException instead of NPE when storage not yet initialized.

Issue Links

• links to: GitHub Pull Request #4699