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https://issues.apache.org/jira/browse/HDFS-10721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15409305#comment-15409305
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Senthilkumar commented on HDFS-10721:
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The case i was explaining in my previous comment is not rare one.. We use that
in our production server.. If we allow NFSClients to start using entire /
directory like ( shared one ) we have take care of Quota as well .. So better
to give control to Hadoop Admins to share only specific directories and
NFSClients should play with that .. What do you suggest ?
b_webapp => c_user .. In my case both users hold WRITE Permission.
> HDFS NFS Gateway - Exporting multiple Directories
> --------------------------------------------------
>
> Key: HDFS-10721
> URL: https://issues.apache.org/jira/browse/HDFS-10721
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Reporter: Senthilkumar
> Priority: Minor
>
> Current HDFS NFS gateway Supports exporting only one Directory..
> Example :
> <property>
> <name>nfs.export.point</name>
> <value>/user</value>
> </property>
> This property helps us to export particular directory ..
> Code Block :
> public RpcProgramMountd(NfsConfiguration config,
> DatagramSocket registrationSocket, boolean allowInsecurePorts)
> throws IOException {
> // Note that RPC cache is not enabled
> super("mountd", "localhost", config.getInt(
> NfsConfigKeys.DFS_NFS_MOUNTD_PORT_KEY,
> NfsConfigKeys.DFS_NFS_MOUNTD_PORT_DEFAULT), PROGRAM, VERSION_1,
> VERSION_3, registrationSocket, allowInsecurePorts);
> exports = new ArrayList<String>();
> exports.add(config.get(NfsConfigKeys.DFS_NFS_EXPORT_POINT_KEY,
> NfsConfigKeys.DFS_NFS_EXPORT_POINT_DEFAULT));
> this.hostsMatcher = NfsExports.getInstance(config);
> this.mounts = Collections.synchronizedList(new ArrayList<MountEntry>());
> UserGroupInformation.setConfiguration(config);
> SecurityUtil.login(config, NfsConfigKeys.DFS_NFS_KEYTAB_FILE_KEY,
> NfsConfigKeys.DFS_NFS_KERBEROS_PRINCIPAL_KEY);
> this.dfsClient = new DFSClient(NameNode.getAddress(config), config);
> }
> Export List:
> exports.add(config.get(NfsConfigKeys.DFS_NFS_EXPORT_POINT_KEY,
> NfsConfigKeys.DFS_NFS_EXPORT_POINT_DEFAULT));
> Current Code is supporting only one directory to be exposed ... Based on our
> example /user can be exported ..
> Most of the production environment expects more number of directories should
> be exported and the same can be mounted for different clients..
> Example:
> <property>
> <name>nfs.export.point</name>
> <value>/user,/data/web_crawler,/app-logs</value>
> </property>
> Here i have three directories to be exposed ..
> 1) /user
> 2) /data/web_crawler
> 3) /app-logs
> This would help us to mount directories for particular client ( Say client A
> wants to write data in /app-logs - Hadoop Admin can mount and handover to
> clients ).
> Please advise here.. Sorry if this feature is already implemented..
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