HDFS-7326. Add documentation for hdfs debug commands (Vijay Bhat via Colin P. McCabe)
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@ -490,6 +490,9 @@ Release 2.7.0 - UNRELEASED
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HDFS-7323. Move the get/setStoragePolicy commands out from dfsadmin.
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(jing9 via yliu)
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HDFS-7326: Add documentation for hdfs debug commands (Vijay Bhat via Colin
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P. McCabe)
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OPTIMIZATIONS
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HDFS-7454. Reduce memory footprint for AclEntries in NameNode.
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@ -464,3 +464,46 @@ HDFS Commands Guide
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| -geteditsize | Prints the number of uncheckpointed transactions on
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| the NameNode.
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*----------------------+------------------------------------------------------+
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* Debug Commands
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Useful commands to help administrators debug HDFS issues, like validating
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block files and calling recoverLease.
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** <<<verify>>>
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Verify HDFS metadata and block files. If a block file is specified, we
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will verify that the checksums in the metadata file match the block
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file.
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Usage: <<<hdfs dfs verify [-meta <metadata-file>] [-block <block-file>]>>>
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*------------------------+----------------------------------------------------+
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|| COMMAND_OPTION | Description
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*------------------------+----------------------------------------------------+
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| -meta <metadata-file> | Absolute path for the metadata file on the local file
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| | system of the data node.
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*------------------------+----------------------------------------------------+
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| -block <block-file> | Optional parameter to specify the absolute path for
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| | the block file on the local file system of the data
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| | node.
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*------------------------+----------------------------------------------------+
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** <<<recoverLease>>>
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Recover the lease on the specified path. The path must reside on an
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HDFS filesystem. The default number of retries is 1.
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Usage: <<<hdfs dfs recoverLease [-path <path>] [-retries <num-retries>]>>>
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*-------------------------------+--------------------------------------------+
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|| COMMAND_OPTION || Description
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*-------------------------------+---------------------------------------------+
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| [-path <path>] | HDFS path for which to recover the lease.
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*-------------------------------+---------------------------------------------+
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| [-retries <num-retries>] | Number of times the client will retry calling
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| | recoverLease. The default number of retries
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| | is 1.
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*-------------------------------+---------------------------------------------+
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