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https://issues.apache.org/jira/browse/HDFS-8986?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Chen updated HDFS-8986:
----------------------------
Attachment: HDFS-8986.04.patch
I had a round of self-review. Patch 4 is attached with some comments in triky
areas, and a checkstyle fix.
I should also mention that, with this approach, there's more overhead. This is
true even when {{-x}} is not given - the behavior is compatible still though.
- calculation for snapshots are always performed.
- {{ContentSummary}} is bigger than before (since it holds more {{long}}
fields) so we need to transfer a larger object.
IMHO, since HDFS-4995 adds more control over the calculation, and we're not
creating a lot of {{ContentSummary}} objects, the above 2 things should be fine.
> Add option to -du to calculate directory space usage excluding snapshots
> ------------------------------------------------------------------------
>
> Key: HDFS-8986
> URL: https://issues.apache.org/jira/browse/HDFS-8986
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: snapshots
> Reporter: Gautam Gopalakrishnan
> Assignee: Xiao Chen
> Attachments: HDFS-8986.01.patch, HDFS-8986.02.patch,
> HDFS-8986.03.patch, HDFS-8986.04.patch
>
>
> When running {{hadoop fs -du}} on a snapshotted directory (or one of its
> children), the report includes space consumed by blocks that are only present
> in the snapshots. This is confusing for end users.
> {noformat}
> $ hadoop fs -du -h -s /tmp/parent /tmp/parent/*
> 799.7 M 2.3 G /tmp/parent
> 799.7 M 2.3 G /tmp/parent/sub1
> $ hdfs dfs -createSnapshot /tmp/parent snap1
> Created snapshot /tmp/parent/.snapshot/snap1
> $ hadoop fs -rm -skipTrash /tmp/parent/sub1/*
> ...
> $ hadoop fs -du -h -s /tmp/parent /tmp/parent/*
> 799.7 M 2.3 G /tmp/parent
> 799.7 M 2.3 G /tmp/parent/sub1
> $ hdfs dfs -deleteSnapshot /tmp/parent snap1
> $ hadoop fs -du -h -s /tmp/parent /tmp/parent/*
> 0 0 /tmp/parent
> 0 0 /tmp/parent/sub1
> {noformat}
> It would be helpful if we had a flag, say -X, to exclude any snapshot related
> disk usage in the output
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