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https://issues.apache.org/jira/browse/HDFS-10172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15227981#comment-15227981
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Yuanbo Liu commented on HDFS-10172:
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The reason why other hdfs commands do not have -usage command is that those
classes of commands override the method "run" when they inherit FsShell, but
the class of command "erasurecode" does not override it.
> hdfs erasurecode command should remove the redundant -usage option
> ------------------------------------------------------------------
>
> Key: HDFS-10172
> URL: https://issues.apache.org/jira/browse/HDFS-10172
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.0.0
> Reporter: Wei-Chiu Chuang
> Priority: Minor
> Labels: newbie
>
> {{hdfs erasurecode}} has two similar options {{-help}} and {{-usage}}.
> {noformat}
> hdfs erasurecode -usage getPolicy
> Usage: hdfs erasurecode [generic options] -getPolicy <path>
> hdfs erasurecode -help getPolicy
> -getPolicy <path> :
> Get erasure coding policy information about at specified path
> {noformat}
> I don't think the -usage option is that useful, because -help option already
> covers that. No other HDFS commands has the same -usage command.
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