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https://issues.apache.org/jira/browse/HDFS-11061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15611026#comment-15611026
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Vinayakumar B commented on HDFS-11061:
--------------------------------------
{quote}
+ "If a comma-separated list of storage types is given after the -t
option, \n"
+ "it displays the quota and usage for the specified types. \n"
+ "Otherwise, it displays the quota and usage for all the storage \n"
- + "types that support quota \n"
+ + "types that support quota. The list of possible storage "
+ + "types(case insensitive):\n"
+ + "empty string, all, ram_disk, ssd, disk and archive.\n"
{quote}
Empty string, is nothing but, only "-t" switch is given, but not any values
after that. The result is same as 'all' passed as value for -t. So, this can be
mentioned explicitly. But, 'empty string' and 'all' are not storagetypes. i.e.
when 'all' cannot be combined with storagetypes. But actual storagetypes can be
comma separated multiple values.
I think this sentence can be corrected more.
> 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
>
>
> 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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