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HDFS-6717. Merging change r1614125 from trunk 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1614129 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Brandon Li 2014-07-28 18:57:52 +00:00
parent b41896f0a2
commit 81796d4741
2 changed files with 24 additions and 39 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -688,6 +688,9 @@ Release 2.5.0 - UNRELEASED
HDFS-6723. New NN webUI no longer displays decommissioned state for dead node.
(Ming Ma via wheat9)
HDFS-6717. JIRA HDFS-5804 breaks default nfs-gateway behavior for unsecured config
(brandonli)
BREAKDOWN OF HDFS-2006 SUBTASKS AND RELATED JIRAS
HDFS-6299. Protobuf for XAttr and client-side implementation. (Yi Liu via umamahesh)

60
hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HdfsNfsGateway.apt.vm
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@ -44,10 +44,13 @@ HDFS NFS Gateway
* {Configuration}
The user running the NFS-gateway must be able to proxy all the users using the NFS mounts.
For instance, if user 'nfsserver' is running the gateway, and users belonging to the groups 'nfs-users1'
and 'nfs-users2' use the NFS mounts, then in core-site.xml of the namenode, the following must be set
(NOTE: replace 'nfsserver' with the user name starting the gateway in your cluster):
The NFS-gateway uses proxy user to proxy all the users accessing the NFS mounts.
In non-secure mode, the user running the gateway is the proxy user, while in secure mode the
user in Kerberos keytab is the proxy user. Suppose the proxy user is 'nfsserver'
and users belonging to the groups 'nfs-users1'
and 'nfs-users2' use the NFS mounts, then in core-site.xml of the NameNode, the following
two properities must be set and only NameNode needs restart after the configuration change
(NOTE: replace the string 'nfsserver' with the proxy user name in your cluster):
----
<property>
@ -72,7 +75,9 @@ HDFS NFS Gateway
----
The above are the only required configuration for the NFS gateway in non-secure mode. For Kerberized
hadoop clusters, the following configurations need to be added to hdfs-site.xml:
hadoop clusters, the following configurations need to be added to hdfs-site.xml for the gateway (NOTE: replace
string "nfsserver" with the proxy user name and ensure the user contained in the keytab is
also the same proxy user):
----
<property>
@ -87,6 +92,8 @@ HDFS NFS Gateway
<value>nfsserver/_HOST@YOUR-REALM.COM</value>
</property>
----
The rest of the NFS gateway configurations are optional for both secure and non-secure mode.
The AIX NFS client has a {{{https://issues.apache.org/jira/browse/HDFS-6549}few known issues}}
that prevent it from working correctly by default with the HDFS NFS
@ -108,7 +115,7 @@ HDFS NFS Gateway
have been committed.
It's strongly recommended for the users to update a few configuration properties based on their use
cases. All the related configuration properties can be added or updated in hdfs-site.xml.
cases. All the following configuration properties can be added or updated in hdfs-site.xml.
* If the client mounts the export with access time update allowed, make sure the following
property is not disabled in the configuration file. Only NameNode needs to restart after
@ -145,36 +152,6 @@ HDFS NFS Gateway
</property>
----
* For optimal performance, it is recommended that rtmax be updated to
1MB. However, note that this 1MB is a per client allocation, and not
from a shared memory pool, and therefore a larger value may adversely
affect small reads, consuming a lot of memory. The maximum value of
this property is 1MB.
----
<property>
<name>nfs.rtmax</name>
<value>1048576</value>
<description>This is the maximum size in bytes of a READ request
supported by the NFS gateway. If you change this, make sure you
also update the nfs mount's rsize(add rsize= # of bytes to the
mount directive).
</description>
</property>
----
----
<property>
<name>nfs.wtmax</name>
<value>65536</value>
<description>This is the maximum size in bytes of a WRITE request
supported by the NFS gateway. If you change this, make sure you
also update the nfs mount's wsize(add wsize= # of bytes to the
mount directive).
</description>
</property>
----
* By default, the export can be mounted by any client. To better control the access,
users can update the following property. The value string contains machine name and
access privilege, separated by whitespace
@ -238,8 +215,10 @@ HDFS NFS Gateway
[[3]] Start mountd and nfsd.
No root privileges are required for this command. However, ensure that the user starting
the Hadoop cluster and the user starting the NFS gateway are same.
No root privileges are required for this command. In non-secure mode, the NFS gateway
should be started by the proxy user mentioned at the beginning of this user guide.
While in secure mode, any user can start NFS gateway
as long as the user has read access to the Kerberos keytab defined in "nfs.keytab.file".
-------------------------
hadoop nfs3
@ -339,7 +318,10 @@ HDFS NFS Gateway
-------------------------------------------------------------------
Then the users can access HDFS as part of the local file system except that,
hard link and random write are not supported yet.
hard link and random write are not supported yet. To optimize the performance
of large file I/O, one can increase the NFS transfer size(rsize and wsize) during mount.
By default, NFS gateway supports 1MB as the maximum transfer size. For larger data
transfer size, one needs to update "nfs.rtmax" and "nfs.rtmax" in hdfs-site.xml.
* {Allow mounts from unprivileged clients}