tomscut commented on pull request #3366:
URL: https://github.com/apache/hadoop/pull/3366#issuecomment-916639192
@ayushtkn @ferhui @Hexiaoqiao Could you please review the code? Thanks a lot.
The standard deviation is calculated by referring to
FSNamesystem#getNodeUsage. The key change is
FSNamesystem#getBlockPoolUsedPercentStdDev, :
```
public float getBlockPoolUsedPercentStdDev(StorageReport[] storageReports)
{
ArrayList<Float> usagePercentList = new ArrayList<>();
float totalUsagePercent = 0.0f;
float dev = 0.0f;
if (storageReports.length == 0) {
return dev;
}
for (StorageReport s : storageReports) {
usagePercentList.add(s.getBlockPoolUsagePercent());
totalUsagePercent += s.getBlockPoolUsagePercent();
}
totalUsagePercent /= storageReports.length;
Collections.sort(usagePercentList);
for (Float usagePercent : usagePercentList) {
dev += (usagePercent - totalUsagePercent)
* (usagePercent - totalUsagePercent);
}
dev = (float) Math.sqrt(dev / usagePercentList.size());
return dev;
}
```
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