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https://issues.apache.org/jira/browse/HDFS-11061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15612621#comment-15612621
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Xiaoyu Yao commented on HDFS-11061:
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Agree with [~jojochuang] regarding case-insensitive usage of ALL in
FileSystemShell.md. +1 after that is fixed.
> Fix dfs -count -t or update its documentation
> ---------------------------------------------
>
> Key: HDFS-11061
> URL: https://issues.apache.org/jira/browse/HDFS-11061
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: fs
> Reporter: Wei-Chiu Chuang
> Assignee: Yiqun Lin
> Priority: Minor
> Labels: supportability
> Attachments: HDFS-11061.001.patch, HDFS-11061.002.patch,
> HDFS-11061.003.patch
>
>
> According to dfs -count command line help, -t option must be used along with
> -q.
> * However, the current behavior is that -t can be used without -q, it's just
> silently ignored.
> * In addition, -t may also be used with -u.
> * The FileSystemShell doc does not state -t must be used along with -q. This
> should either be enforced in the code, or update the doc/command line.
> * Also, the list of possible parameters for -t option is not described in the
> doc. Looking at the code (Count.java), the list of possible parameters are
> either empty string (="all"), "all", "ram_disk", "ssd", "disk" or "archive"
> (caseless)
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