Author: arp
Date: Thu Aug 7 19:46:38 2014
New Revision: 1616577
URL: http://svn.apache.org/r1616577
Log:
HDFS-6781. Add file missed in previous commit.
Added:
hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm
Added:
hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm
URL:
http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm?rev=1616577&view=auto
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hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm
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hadoop/common/branches/branch-2/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm
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+~~ Licensed under the Apache License, Version 2.0 (the "License");
+~~ you may not use this file except in compliance with the License.
+~~ You may obtain a copy of the License at
+~~
+~~ http://www.apache.org/licenses/LICENSE-2.0
+~~
+~~ Unless required by applicable law or agreed to in writing, software
+~~ distributed under the License is distributed on an "AS IS" BASIS,
+~~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+~~ See the License for the specific language governing permissions and
+~~ limitations under the License. See accompanying LICENSE file.
+
+ ---
+ HDFS Commands Guide
+ ---
+ ---
+ ${maven.build.timestamp}
+
+HDFS Commands Guide
+
+%{toc|section=1|fromDepth=2|toDepth=4}
+
+* Overview
+
+ All HDFS commands are invoked by the <<<bin/hdfs>>> script. Running the
+ hdfs script without any arguments prints the description for all
+ commands.
+
+ Usage: <<<hdfs [--config confdir] [COMMAND] [GENERIC_OPTIONS]
+ [COMMAND_OPTIONS]>>>
+
+ Hadoop has an option parsing framework that employs parsing generic options
+ as well as running classes.
+
+*-----------------------+---------------+
+|| COMMAND_OPTION || Description
+*-----------------------+---------------+
+| <<<--config confdir>>>| Overwrites the default Configuration directory.
+| | Default is <<<${HADOOP_HOME}/conf>>>.
+*-----------------------+---------------+
+| GENERIC_OPTIONS | The common set of options supported by multiple
+| | commands. Full list is
+| |
{{{../hadoop-common/CommandsManual.html#Generic_Options}here}}.
+*-----------------------+---------------+
+| COMMAND_OPTIONS | Various commands with their options are described in
+| | the following sections. The commands have been
+| | grouped into {{{User Commands}}} and
+| | {{{Administration Commands}}}.
+*-----------------------+---------------+
+
+* User Commands
+
+ Commands useful for users of a hadoop cluster.
+
+** <<<dfs>>>
+
+ Usage: <<<hdfs dfs [GENERIC_OPTIONS] [COMMAND_OPTIONS]>>>
+
+ Run a filesystem command on the file system supported in Hadoop.
+ The various COMMAND_OPTIONS can be found at
+ {{{../hadoop-common/FileSystemShell.html}File System Shell Guide}}.
+
+** <<<fetchdt>>>
+
+ Gets Delegation Token from a NameNode.
+ See {{{./HdfsUserGuide.html#fetchdt}fetchdt}} for more info.
+
+ Usage: <<<hdfs fetchdt [GENERIC_OPTIONS]
+ [--webservice <namenode_http_addr>] <path> >>>
+
+*------------------------------+---------------------------------------------+
+|| COMMAND_OPTION || Description
+*------------------------------+---------------------------------------------+
+| <fileName> | File name to store the token into.
+*------------------------------+---------------------------------------------+
+| --webservice <https_address> | use http protocol instead of RPC
+*------------------------------+---------------------------------------------+
+
+** <<<fsck>>>
+
+ Runs a HDFS filesystem checking utility.
+ See {{{./HdfsUserGuide.html#fsck}fsck}} for more info.
+
+ Usage: <<<hdfs fsck [GENERIC_OPTIONS] <path>
+ [-move | -delete | -openforwrite]
+ [-files [-blocks [-locations | -racks]]]>>>
+
+*------------------+---------------------------------------------+
+|| COMMAND_OPTION || Description
+*------------------+---------------------------------------------+
+| <path> | Start checking from this path.
+*------------------+---------------------------------------------+
+| -move | Move corrupted files to /lost+found
+*------------------+---------------------------------------------+
+| -delete | Delete corrupted files.
+*------------------+---------------------------------------------+
+| -openforwrite | Print out files opened for write.
+*------------------+---------------------------------------------+
+| -files | Print out files being checked.
+*------------------+---------------------------------------------+
+| -blocks | Print out block report.
+*------------------+---------------------------------------------+
+| -locations | Print out locations for every block.
+*------------------+---------------------------------------------+
+| -racks | Print out network topology for data-node locations.
+*------------------+---------------------------------------------+
+
+* Administration Commands
+
+ Commands useful for administrators of a hadoop cluster.
+
+** <<<balancer>>>
+
+ Runs a cluster balancing utility. An administrator can simply press Ctrl-C
+ to stop the rebalancing process. See
+ {{{./HdfsUserGuide.html#Balancer}Balancer}} for more details.
+
+ Usage: <<<hdfs balancer [-threshold <threshold>] [-policy <policy>]>>>
+
+*------------------------+----------------------------------------------------+
+|| COMMAND_OPTION | Description
+*------------------------+----------------------------------------------------+
+| -threshold <threshold> | Percentage of disk capacity. This overwrites the
+| | default threshold.
+*------------------------+----------------------------------------------------+
+| -policy <policy> | <<<datanode>>> (default): Cluster is balanced if
+| | each datanode is balanced. \
+| | <<<blockpool>>>: Cluster is balanced if each block
+| | pool in each datanode is balanced.
+*------------------------+----------------------------------------------------+
+
+ Note that the <<<blockpool>>> policy is more strict than the <<<datanode>>>
+ policy.
+
+** <<<datanode>>>
+
+ Runs a HDFS datanode.
+
+ Usage: <<<hdfs datanode [-regular | -rollback | -rollingupgrace rollback]>>>
+
+*-----------------+-----------------------------------------------------------+
+|| COMMAND_OPTION || Description
+*-----------------+-----------------------------------------------------------+
+| -regular | Normal datanode startup (default).
+*-----------------+-----------------------------------------------------------+
+| -rollback | Rollsback the datanode to the previous version. This should
+| | be used after stopping the datanode and distributing the
+| | old hadoop version.
+*-----------------+-----------------------------------------------------------+
+| -rollingupgrade rollback | Rollsback a rolling upgrade operation.
+*-----------------+-----------------------------------------------------------+
+
+** <<<dfsadmin>>>
+
+ Runs a HDFS dfsadmin client.
+
+ Usage: <<<hdfs dfsadmin [GENERIC_OPTIONS]
+ [-report [-live] [-dead] [-decommissioning]]
+ [-safemode enter | leave | get | wait]
+ [-saveNamespace]
+ [-rollEdits]
+ [-restoreFailedStorage true|false|check]
+ [-refreshNodes]
+ [-setQuota <quota> <dirname>...<dirname>]
+ [-clrQuota <dirname>...<dirname>]
+ [-setSpaceQuota <quota> <dirname>...<dirname>]
+ [-clrSpaceQuota <dirname>...<dirname>]
+ [-finalizeUpgrade]
+ [-rollingUpgrade [<query>|<prepare>|<finalize>]]
+ [-metasave filename]
+ [-refreshServiceAcl]
+ [-refreshUserToGroupsMappings]
+ [-refreshSuperUserGroupsConfiguration]
+ [-refreshCallQueue]
+ [-refresh <host:ipc_port> <key> [arg1..argn]]
+ [-printTopology]
+ [-refreshNamenodes datanodehost:port]
+ [-deleteBlockPool datanode-host:port blockpoolId [force]]
+ [-setBalancerBandwidth <bandwidth in bytes per second>]
+ [-allowSnapshot <snapshotDir>]
+ [-disallowSnapshot <snapshotDir>]
+ [-fetchImage <local directory>]
+ [-shutdownDatanode <datanode_host:ipc_port> [upgrade]]
+ [-getDatanodeInfo <datanode_host:ipc_port>]
+ [-help [cmd]]>>>
+
+*-----------------+-----------------------------------------------------------+
+|| COMMAND_OPTION || Description
+*-----------------+-----------------------------------------------------------+
+| -report [-live] [-dead] [-decommissioning] | Reports basic filesystem
+ | information and statistics. Optional flags may be used to
+ | filter the list of displayed DataNodes.
+*-----------------+-----------------------------------------------------------+
+| -safemode enter\|leave\|get\|wait | Safe mode maintenance command. Safe
+ | mode is a Namenode state in which it \
+ | 1. does not accept changes to the name space (read-only) \
+ | 2. does not replicate or delete blocks. \
+ | Safe mode is entered automatically at Namenode startup, and
+ | leaves safe mode automatically when the configured minimum
+ | percentage of blocks satisfies the minimum replication
+ | condition. Safe mode can also be entered manually, but then
+ | it can only be turned off manually as well.
+*-----------------+-----------------------------------------------------------+
+| -saveNamespace | Save current namespace into storage directories and reset
+ | edits log. Requires safe mode.
+*-----------------+-----------------------------------------------------------+
+| -rollEdits | Rolls the edit log on the active NameNode.
+*-----------------+-----------------------------------------------------------+
+| -restoreFailedStorage true\|false\|check | This option will turn on/off
+ | automatic attempt to restore failed storage replicas.
+ | If a failed storage becomes available again the system will
+ | attempt to restore edits and/or fsimage during checkpoint.
+ | 'check' option will return current setting.
+*-----------------+-----------------------------------------------------------+
+| -refreshNodes | Re-read the hosts and exclude files to update the set of
+ | Datanodes that are allowed to connect to the Namenode and
+ | those that should be decommissioned or recommissioned.
+*-----------------+-----------------------------------------------------------+
+| -setQuota \<quota\> \<dirname\>...\<dirname\> | See
+ |
{{{../hadoop-hdfs/HdfsQuotaAdminGuide.html#Administrative_Commands}HDFS Quotas
Guide}}
+ | for the detail.
+*-----------------+-----------------------------------------------------------+
+| -clrQuota \<dirname\>...\<dirname\> | See
+ |
{{{../hadoop-hdfs/HdfsQuotaAdminGuide.html#Administrative_Commands}HDFS Quotas
Guide}}
+ | for the detail.
+*-----------------+-----------------------------------------------------------+
+| -setSpaceQuota \<quota\> \<dirname\>...\<dirname\> | See
+ |
{{{../hadoop-hdfs/HdfsQuotaAdminGuide.html#Administrative_Commands}HDFS Quotas
Guide}}
+ | for the detail.
+*-----------------+-----------------------------------------------------------+
+| -clrSpaceQuota \<dirname\>...\<dirname\> | See
+ |
{{{../hadoop-hdfs/HdfsQuotaAdminGuide.html#Administrative_Commands}HDFS Quotas
Guide}}
+ | for the detail.
+*-----------------+-----------------------------------------------------------+
+| -finalizeUpgrade| Finalize upgrade of HDFS. Datanodes delete their previous
+ | version working directories, followed by Namenode doing the
+ | same. This completes the upgrade process.
+*-----------------+-----------------------------------------------------------+
+| -rollingUpgrade [\<query\>\|\<prepare\>\|\<finalize\>] | See
+ |
{{{../hadoop-hdfs/HdfsRollingUpgrade.html#dfsadmin_-rollingUpgrade}Rolling
Upgrade document}}
+ | for the detail.
+*-----------------+-----------------------------------------------------------+
+| -metasave filename | Save Namenode's primary data structures to <filename> in
+ | the directory specified by hadoop.log.dir property.
+ | <filename> is overwritten if it exists.
+ | <filename> will contain one line for each of the following\
+ | 1. Datanodes heart beating with Namenode\
+ | 2. Blocks waiting to be replicated\
+ | 3. Blocks currrently being replicated\
+ | 4. Blocks waiting to be deleted
+*-----------------+-----------------------------------------------------------+
+| -refreshServiceAcl | Reload the service-level authorization policy file.
+*-----------------+-----------------------------------------------------------+
+| -refreshUserToGroupsMappings | Refresh user-to-groups mappings.
+*-----------------+-----------------------------------------------------------+
+| -refreshSuperUserGroupsConfiguration |Refresh superuser proxy groups mappings
+*-----------------+-----------------------------------------------------------+
+| -refreshCallQueue | Reload the call queue from config.
+*-----------------+-----------------------------------------------------------+
+| -refresh \<host:ipc_port\> \<key\> [arg1..argn] | Triggers a runtime-refresh
+ | of the resource specified by \<key\> on \<host:ipc_port\>.
+ | All other args after are sent to the host.
+*-----------------+-----------------------------------------------------------+
+| -printTopology | Print a tree of the racks and their nodes as reported by
+ | the Namenode
+*-----------------+-----------------------------------------------------------+
+| -refreshNamenodes datanodehost:port | For the given datanode, reloads the
+ | configuration files, stops serving the removed block-pools
+ | and starts serving new block-pools.
+*-----------------+-----------------------------------------------------------+
+| -deleteBlockPool datanode-host:port blockpoolId [force] | If force is passed,
+ | block pool directory for the given blockpool id on the
+ | given datanode is deleted along with its contents,
+ | otherwise the directory is deleted only if it is empty.
+ | The command will fail if datanode is still serving the
+ | block pool. Refer to refreshNamenodes to shutdown a block
+ | pool service on a datanode.
+*-----------------+-----------------------------------------------------------+
+| -setBalancerBandwidth \<bandwidth in bytes per second\> | Changes the network
+ | bandwidth used by each datanode during HDFS block
+ | balancing. \<bandwidth\> is the maximum number of bytes per
+ | second that will be used by each datanode. This value
+ | overrides the dfs.balance.bandwidthPerSec parameter.\
+ | NOTE: The new value is not persistent on the DataNode.
+*-----------------+-----------------------------------------------------------+
+| -allowSnapshot \<snapshotDir\> | Allowing snapshots of a directory to be
+ | created. If the operation completes successfully, the
+ | directory becomes snapshottable.
+*-----------------+-----------------------------------------------------------+
+| -disallowSnapshot \<snapshotDir\> | Disallowing snapshots of a directory to
+ | be created. All snapshots of the directory must be deleted
+ | before disallowing snapshots.
+*-----------------+-----------------------------------------------------------+
+| -fetchImage \<local directory\> | Downloads the most recent fsimage from the
+ | NameNode and saves it in the specified local directory.
+*-----------------+-----------------------------------------------------------+
+| -shutdownDatanode \<datanode_host:ipc_port\> [upgrade] | Submit a shutdown
+ | request for the given datanode. See
+ |
{{{./HdfsRollingUpgrade.html#dfsadmin_-shutdownDatanode}Rolling Upgrade
document}}
+ | for the detail.
+*-----------------+-----------------------------------------------------------+
+| -getDatanodeInfo \<datanode_host:ipc_port\> | Get the information about the
+ | given datanode. See
+ |
{{{./HdfsRollingUpgrade.html#dfsadmin_-getDatanodeInfo}Rolling Upgrade
document}}
+ | for the detail.
+*-----------------+-----------------------------------------------------------+
+| -help [cmd] | Displays help for the given command or all commands if none
+ | is specified.
+*-----------------+-----------------------------------------------------------+
+
+** <<<namenode>>>
+
+ Runs the namenode. More info about the upgrade, rollback and finalize is at
+ {{{./HdfsUserGuide.html#Upgrade_and_Rollback}Upgrade Rollback}}.
+
+ Usage: <<<hdfs namenode [-backup] |
+ [-checkpoint] |
+ [-format [-clusterid cid ] [-force] [-nonInteractive] ] |
+ [-upgrade [-clusterid cid] [-renameReserved<k-v pairs>] ] |
+ [-upgradeOnly [-clusterid cid] [-renameReserved<k-v pairs>] ] |
+ [-rollback] |
+ [-rollingUpgrade <downgrade|rollback> ] |
+ [-finalize] |
+ [-importCheckpoint] |
+ [-initializeSharedEdits] |
+ [-bootstrapStandby] |
+ [-recover [-force] ] |
+ [-metadataVersion ]>>>
+
+*--------------------+--------------------------------------------------------+
+|| COMMAND_OPTION || Description
+*--------------------+--------------------------------------------------------+
+| -backup | Start backup node.
+*--------------------+--------------------------------------------------------+
+| -checkpoint | Start checkpoint node.
+*--------------------+--------------------------------------------------------+
+| -format [-clusterid cid] [-force] [-nonInteractive] | Formats the specified
+ | NameNode. It starts the NameNode, formats it and then
+ | shut it down. -force option formats if the name
+ | directory exists. -nonInteractive option aborts if the
+ | name directory exists, unless -force option is
specified.
+*--------------------+--------------------------------------------------------+
+| -upgrade [-clusterid cid] [-renameReserved\<k-v pairs\>] | Namenode should be
+ | started with upgrade option after
+ | the distribution of new Hadoop version.
+*--------------------+--------------------------------------------------------+
+| -upgradeOnly [-clusterid cid] [-renameReserved\<k-v pairs\>] | Upgrade the
+ | specified NameNode and then shutdown it.
+*--------------------+--------------------------------------------------------+
+| -rollback | Rollsback the NameNode to the previous version. This
+ | should be used after stopping the cluster and
+ | distributing the old Hadoop version.
+*--------------------+--------------------------------------------------------+
+| -rollingUpgrade \<downgrade\|rollback\|started\> | See
+ |
{{{./HdfsRollingUpgrade.html#NameNode_Startup_Options}Rolling Upgrade document}}
+ | for the detail.
+*--------------------+--------------------------------------------------------+
+| -finalize | Finalize will remove the previous state of the files
+ | system. Recent upgrade will become permanent. Rollback
+ | option will not be available anymore. After finalization
+ | it shuts the NameNode down.
+*--------------------+--------------------------------------------------------+
+| -importCheckpoint | Loads image from a checkpoint directory and save it
+ | into the current one. Checkpoint dir is read from
+ | property fs.checkpoint.dir
+*--------------------+--------------------------------------------------------+
+| -initializeSharedEdits | Format a new shared edits dir and copy in enough
+ | edit log segments so that the standby NameNode can start
+ | up.
+*--------------------+--------------------------------------------------------+
+| -bootstrapStandby | Allows the standby NameNode's storage directories to be
+ | bootstrapped by copying the latest namespace snapshot
+ | from the active NameNode. This is used when first
+ | configuring an HA cluster.
+*--------------------+--------------------------------------------------------+
+| -recover [-force] | Recover lost metadata on a corrupt filesystem. See
+ | {{{./HdfsUserGuide.html#Recovery_Mode}HDFS User Guide}}
+ | for the detail.
+*--------------------+--------------------------------------------------------+
+| -metadataVersion | Verify that configured directories exist, then print the
+ | metadata versions of the software and the image.
+*--------------------+--------------------------------------------------------+
+
+** <<<secondarynamenode>>>
+
+ Runs the HDFS secondary namenode.
+ See {{{./HdfsUserGuide.html#Secondary_NameNode}Secondary Namenode}}
+ for more info.
+
+ Usage: <<<hdfs secondarynamenode [-checkpoint [force]] | [-format] |
+ [-geteditsize]>>>
+
+*----------------------+------------------------------------------------------+
+|| COMMAND_OPTION || Description
+*----------------------+------------------------------------------------------+
+| -checkpoint [force] | Checkpoints the SecondaryNameNode if EditLog size
+ | >= fs.checkpoint.size. If <<<force>>> is used,
+ | checkpoint irrespective of EditLog size.
+*----------------------+------------------------------------------------------+
+| -format | Format the local storage during startup.
+*----------------------+------------------------------------------------------+
+| -geteditsize | Prints the number of uncheckpointed transactions on
+ | the NameNode.
+*----------------------+------------------------------------------------------+
