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https://issues.apache.org/jira/browse/HDFS-16854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17642641#comment-17642641
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Wei-Chiu Chuang commented on HDFS-16854:
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[~liuml07] thanks for the tip.
I still find it confusing occasionally because not all Hadoop commands uses
ToolRunner to prints generic command help.
MAPREDUCE-7398 looks hacky to me but I'll give it a try.
> TestDFSIO to support non-default file system
> --------------------------------------------
>
> Key: HDFS-16854
> URL: https://issues.apache.org/jira/browse/HDFS-16854
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Major
>
> TestDFSIO expects a parameter {{-Dtest.build.data=}} which is where the data
> is located. Only paths on the default file system is supported. Running t
> against other file systems, such as Ozone, throws an exception.
> It can be worked around by specifying {{-Dfs.defaultFS=}} but it would be
> even nicer to support non-default file systems out of box, because no one
> would know this trick unless she looks at the code.
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