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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8986) Add option to -du to calculate directory space usage excluding snapshots
Date Tue, 01 Dec 2015 00:19:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15032770#comment-15032770
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Chris Nauroth commented on HDFS-8986:
-------------------------------------

Within the scope of this JIRA, I also suggest that we update the documentation (hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsSnapshots.md)
to give a thorough description of the behavior of {{-du}} and {{-count}} in the presence of
snapshots.  The current behavior is helpful for seeing the full metadata cost of a path, but
it can be a source of confusion for users.

> 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: Jagadesh Kiran N
>
> 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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