ZanderXu opened a new pull request, #4672:
URL: https://github.com/apache/hadoop/pull/4672
### Description of PR
Fix incorrect placeholder in DataNode.java
```
public String getDiskBalancerStatus() {
try {
return getDiskBalancer().queryWorkStatus().toJsonString();
} catch (IOException ex) {
// incorrect placeholder
LOG.debug("Reading diskbalancer Status failed. ex:{}", ex);
return "";
}
}
```
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