hfutatzhanghb opened a new pull request #3750:
URL: https://github.com/apache/hadoop/pull/3750
… occur
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### Description of PR
RefreshNodes should not use System.out but System.err when exceptions occur
### How was this patch tested?
No needs to test
### For code changes:
- https://issues.apache.org/jira/browse/HDFS-16372
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