[jira] [Created] (HDFS-10721) HDFS NFS Gateway - Exporting multiple Directories

["Senthilkumar (JIRA)" <ji...@apache.org>]

Senthilkumar created HDFS-10721:
-----------------------------------

             Summary: 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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