Mingliang Liu created HDFS-10747:
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Summary: 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
[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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