Jimvin opened a new pull request, #8341:
URL: https://github.com/apache/hadoop/pull/8341
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### Description of PR
This patch changes the hostname resolution check in HostSet.add() to skip
unresolved hosts rather than throwing an IllegalArgumentException. It fixes
`hdfs dfsadmin -report` where one or more datanode hostnames are unresolvable.
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
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