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HDFS-7254. Add documentation for hot swaping DataNode drives (Lei Xu via Colin P. McCabe) 

(cherry picked from commit 66e8187ea1)
This commit is contained in:
Colin Patrick Mccabe 2014-10-22 13:27:51 -07:00
parent 5e6494ea95
commit c212347d32
3 changed files with 30 additions and 0 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -28,6 +28,9 @@ Release 2.7.0 - UNRELEASED
HDFS-7221. TestDNFencingWithReplication fails consistently. (Charles Lamb via wang)
HDFS-7254. Add documentation for hot swaping DataNode drives (Lei Xu via
Colin P. McCabe)
OPTIMIZATIONS
BUG FIXES

7
hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HDFSCommands.apt.vm
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@ -191,6 +191,7 @@ HDFS Commands Guide
[-refreshSuperUserGroupsConfiguration]
[-refreshCallQueue]
[-refresh <host:ipc_port> <key> [arg1..argn]]
[-reconfig <datanode|...> <host:ipc_port> <start|status>]
[-printTopology]
[-refreshNamenodes datanodehost:port]
[-deleteBlockPool datanode-host:port blockpoolId [force]]
@ -284,6 +285,12 @@ HDFS Commands Guide
| of the resource specified by \<key\> on \<host:ipc_port\>.
| All other args after are sent to the host.
*-----------------+-----------------------------------------------------------+
| -reconfig <datanode|...> <host:ipc_port> <start|status> | Start
| reconfiguration or get the status of an ongoing
| reconfiguration. The second parameter specifies the node
| type. Currently, only reloading DataNode's configuration is
| supported.
*-----------------+-----------------------------------------------------------+
| -printTopology | Print a tree of the racks and their nodes as reported by
| the Namenode
*-----------------+-----------------------------------------------------------+

20
hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HdfsUserGuide.apt.vm
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@ -486,6 +486,26 @@ HDFS Users Guide
This is because data inconsistency can result if an edit log operation
refers to the destination of an automatically renamed file.
* DataNode Hot Swap Drive
Datanode supports hot swappable drives. The user can add or replace HDFS data
volumes without shutting down the DataNode. The following briefly describes
the typical hot swapping drive procedure:
* If there are new storage directories, the user should format them and mount them
appropriately.
* The user updates the DataNode configuration <<<dfs.datanode.data.dir>>>
to reflect the data volume directories that will be actively in use.
* The user runs <<<dfsadmin -reconfig datanode HOST:PORT start>>> to start
the reconfiguration process. The user can use <<<dfsadmin -reconfig
datanode HOST:PORT status>>> to query the running status of the reconfiguration
task.
* Once the reconfiguration task has completed, the user can safely <<<umount>>>
the removed data volume directories and physically remove the disks.
* File Permissions and Security
The file permissions are designed to be similar to file permissions on