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Taikun OCP Guide

Table of Contents

HDFS native driver

HDFS native driver is a plugin based on the OpenStack manila service,
which uses Hadoop distributed file system (HDFS), a distributed file
system designed to hold very large amounts of data, and provide
high-throughput access to the data.

A manila share in this driver is a subdirectory in hdfs root
directory. Instances talk directly to the HDFS storage backend with
‘hdfs’ protocol. And access to each share is allowed by user based
access type, which is aligned with HDFS ACLs to support access control
of multiple users and groups.

Network configuration

The storage backend and manila hosts should be in a flat network,
otherwise, the L3 connectivity between them should exist.

Supported shared filesystems

  • HDFS (authentication by user)

Supported Operations

  • Create HDFS share
  • Delete HDFS share
  • Allow HDFS Share access
    • Only support user access type
    • Support level of access (ro/rw)
  • Deny HDFS Share access
  • Create snapshot
  • Delete snapshot
  • Create share from snapshot
  • Extend share

Requirements

  • Install HDFS package, version >= 2.4.x, on the storage
    backend
  • To enable access control, the HDFS file system must have ACLs
    enabled
  • Establish network connection between the manila host and storage
    backend

Manila driver configuration

  • share_driver =
    manila.share.drivers.hdfs.hdfs_native.HDFSNativeShareDriver
  • hdfs_namenode_ip = the IP address of
    the HDFS namenode, and only single

    namenode is supported now

  • hdfs_namenode_port = the port of the
    HDFS namenode service
  • hdfs_ssh_port = HDFS namenode SSH
    port
  • hdfs_ssh_name = HDFS namenode SSH
    login name
  • hdfs_ssh_pw = HDFS namenode SSH login
    password, this parameter is not

    necessary, if the following hdfs_ssh_private_key is configured

  • hdfs_ssh_private_key = Path to the
    HDFS namenode private key to ssh login

Known Restrictions

  • This driver does not support network segmented multi-tenancy model.
    Instead multi-tenancy is supported by the tenant specific user
    authentication
  • Only support for single HDFS namenode in Kilo release

The manila.share.drivers.hdfs.hdfs_native Module

manila.share.drivers.hdfs.hdfs_native

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