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Date: Mon, 8 Aug 2016 05:51:20 +0000 (UTC)
From: "Senthilkumar (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-10721) HDFS NFS Gateway - Exporting
 multiple Directories
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archived-at: Mon, 08 Aug 2016 05:51:22 -0000


    [ https://issues.apache.org/jira/browse/HDFS-10721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15411343#comment-15411343 ] 

Senthilkumar commented on HDFS-10721:
-------------------------------------

Thanks [~jzhuge].. Do you have any other suggestions/comments ?? If not Pls assign this JIRA to me to start implementation.

> 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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