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https://issues.apache.org/jira/browse/HDFS-10747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mingliang Liu updated HDFS-10747:
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Attachment: HDFS-10747.000.patch
> o.a.h.hdfs.tools.DebugAdmin usage message is misleading
> -------------------------------------------------------
>
> Key: HDFS-10747
> URL: https://issues.apache.org/jira/browse/HDFS-10747
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Priority: Minor
> Attachments: HDFS-10747.000.patch
>
>
> [HDFS-6917] added a helpful hdfs debug command to validate blocks and call
> recoverlease. The usage doc is kinda misleading, as following:
> {code}
> $ hdfs debug verify
> creating a new configuration
> verify [-meta <metadata-file>] [-block <block-file>]
> Verify HDFS metadata and block files. If a block file is specified, we
> will verify that the checksums in the metadata file match the block
> file.
> {code}
> Actually the {{-meta <metadata-file>}} is necessary. {{[]}} is for optional
> arguments, if we follow the
> [convention|http://pubs.opengroup.org/onlinepubs/9699919799].
> {code}
> $ hdfs debug recoverLease
> creating a new configuration
> recoverLease [-path <path>] [-retries <num-retries>]
> Recover the lease on the specified path. The path must reside on an
> HDFS filesystem. The default number of retries is 1.
> {code}
> {{-path <path>}} is also the same case.
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