maobaolong created HDFS-11752:
---------------------------------
Summary: getNonDfsUsed return 0 if reserved bigger than
actualNonDfsUsed
Key: HDFS-11752
URL: https://issues.apache.org/jira/browse/HDFS-11752
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode, hdfs
Affects Versions: 2.7.1
Reporter: maobaolong
Fix For: 2.7.1
{code}
public long getNonDfsUsed() throws IOException {
long actualNonDfsUsed = getActualNonDfsUsed();
if (actualNonDfsUsed < reserved) {
return 0L;
}
return actualNonDfsUsed - reserved;
}
{code}
The code block above is the function to caculate nonDfsUsed, but in fact it
will let the result to be 0L out of expect. Such as this following situation:
du.reserved = 50G
Disk Capacity = 2048G
Disk Available = 2000G
Dfs used = 30G
usage.getUsed() = dirFile.getTotalSpace() - dirFile.getFreeSpace()
= 2048G - 2000G
= 48G
getActualNonDfsUsed = usage.getUsed() - getDfsUsed()
= 48G - 30G
= 18G
18G < 50G, so the function `getNonDfsUsed` actualNonDfsUsed < reserved, and the
NonDfsUsed will return 0, is that logic make sense?
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