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https://issues.apache.org/jira/browse/HDFS-9038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15996609#comment-15996609
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Vinayakumar B commented on HDFS-9038:
-------------------------------------
{code}
/**
* Unplanned Non-DFS usage, i.e. Extra usage beyond reserved.
*
* @return
* @throws IOException
*/
public long getNonDfsUsed() throws IOException {
long actualNonDfsUsed = getActualNonDfsUsed();
if (actualNonDfsUsed < reserved) {
return 0L;
}
return actualNonDfsUsed - reserved;
}{code}
As the javadoc says, its the UnPlanned Non-DFS usage beyond reserved. If the
actual NonDFS usage is within reserved limits, this returns 0. You can see
multiple discussions happened earlier in comments.
So YES, this logic makes sense.
> DFS reserved space is erroneously counted towards non-DFS used.
> ---------------------------------------------------------------
>
> Key: HDFS-9038
> URL: https://issues.apache.org/jira/browse/HDFS-9038
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.7.1
> Reporter: Chris Nauroth
> Assignee: Brahma Reddy Battula
> Fix For: 2.8.0, 2.7.4, 3.0.0-alpha2
>
> Attachments: GetFree.java, HDFS-9038-002.patch, HDFS-9038-003.patch,
> HDFS-9038-004.patch, HDFS-9038-005.patch, HDFS-9038-006.patch,
> HDFS-9038-007.patch, HDFS-9038-008.patch, HDFS-9038-009.patch,
> HDFS-9038-010.patch, HDFS-9038-011.patch, HDFS-9038-branch-2.7.patch,
> HDFS-9038.patch
>
>
> HDFS-5215 changed the DataNode volume available space calculation to consider
> the reserved space held by the {{dfs.datanode.du.reserved}} configuration
> property. As a side effect, reserved space is now counted towards non-DFS
> used. I don't believe it was intentional to change the definition of non-DFS
> used. This issue proposes restoring the prior behavior: do not count
> reserved space towards non-DFS used.
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