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https://issues.apache.org/jira/browse/HDFS-11752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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maobaolong resolved HDFS-11752.
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Resolution: Not A Problem
> 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
> Labels: datanode, hdfs
> 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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