ZanderXu opened a new pull request, #4890:
URL: https://github.com/apache/hadoop/pull/4890
### Description of PR
`refreshHostsReader` should use the latest configuration and the related
code as bellow:
```
/** Reread include/exclude files. */
private void refreshHostsReader(Configuration conf) throws IOException {
if (conf == null) {
conf = new HdfsConfiguration();
// BUG here
this.hostConfigManager.setConf(conf);
}
this.hostConfigManager.refresh();
}
```
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