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HDFS-7326. Add documentation for hdfs debug commands (Vijay Bhat via Colin P. McCabe) 

(cherry picked from commit b78b4a1536)
This commit is contained in:
Colin Patrick Mccabe 2015-01-12 12:16:36 -08:00
parent 7c4e5ff660
commit e4bb94b0b8
2 changed files with 46 additions and 0 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -233,6 +233,9 @@ Release 2.7.0 - UNRELEASED
HDFS-7323. Move the get/setStoragePolicy commands out from dfsadmin.
(jing9 via yliu)
HDFS-7326: Add documentation for hdfs debug commands (Vijay Bhat via Colin
P. McCabe)
OPTIMIZATIONS
HDFS-7454. Reduce memory footprint for AclEntries in NameNode.

43
hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm
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@ -461,3 +461,46 @@ HDFS Commands Guide
| -geteditsize | Prints the number of uncheckpointed transactions on
| the NameNode.
*----------------------+------------------------------------------------------+
* Debug Commands
Useful commands to help administrators debug HDFS issues, like validating
block files and calling recoverLease.
** <<<verify>>>
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.
Usage: <<<hdfs dfs verify [-meta <metadata-file>] [-block <block-file>]>>>
*------------------------+----------------------------------------------------+
|| COMMAND_OPTION | Description
*------------------------+----------------------------------------------------+
| -meta <metadata-file> | Absolute path for the metadata file on the local file
| | system of the data node.
*------------------------+----------------------------------------------------+
| -block <block-file> | Optional parameter to specify the absolute path for
| | the block file on the local file system of the data
| | node.
*------------------------+----------------------------------------------------+
** <<<recoverLease>>>
Recover the lease on the specified path. The path must reside on an
HDFS filesystem. The default number of retries is 1.
Usage: <<<hdfs dfs recoverLease [-path <path>] [-retries <num-retries>]>>>
*-------------------------------+--------------------------------------------+
|| COMMAND_OPTION || Description
*-------------------------------+---------------------------------------------+
| [-path <path>] | HDFS path for which to recover the lease.
*-------------------------------+---------------------------------------------+
| [-retries <num-retries>] | Number of times the client will retry calling
| | recoverLease. The default number of retries
| | is 1.
*-------------------------------+---------------------------------------------+