Configuring Apache HDFS Encryption
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Preparing the Environment

HDP supports hardware acceleration with Advanced Encryption Standard New Instructions (AES-NI). Compared with the software implementation of AES, hardware acceleration offers an order of magnitude faster encryption/decryption.

CPU Support for AES NI optimization

To use AES-NI optimization you need CPU and library support, described in the following subsections.

AES-NI optimization requires an extended CPU instruction set for AES hardware acceleration.

There are several ways to check for this; for example:

$ cat /proc/cpuinfo | grep aes

Look for output with flags and 'aes'.

Library Support for AES NI optimization

You will need a version of the library that supports hardware acceleration, such as OpenSSL 1.0.1e. (Many OS versions have an older version of the library that does not support AES-NI.)

A version of the library with AES-NI support must be installed on HDFS cluster nodes and MapReduce client hosts -- that is, any host from which you issue HDFS or MapReduce requests. The following instructions describe how to install and configure the library.

RHEL/CentOS 6.5 or later

On HDP cluster nodes, the installed version of supports AES-NI, but you will need to make sure that the symbolic link exists:

$ sudo ln -s /usr/lib64/ /usr/lib64/

On MapReduce client hosts, install the openssl-devel package:

$ sudo yum install openssl-devel

Verifying AES NI Support

To verify that a client host is ready to use the AES-NI instruction set optimization for HDFS encryption, use the following command:

hadoop checknative

You should see a response similar to the following:

15/08/12 13:48:39 INFO bzip2.Bzip2Factory: Successfully loaded & initialized native-bzip2 library system-native
14/12/12 13:48:39 INFO zlib.ZlibFactory: Successfully loaded & initialized native-zlib library
Native library checking:
hadoop:  true /usr/lib/hadoop/lib/native/
zlib:    true /lib64/
snappy:  true /usr/lib64/
lz4:     true revision:99
bzip2:   true /lib64/
openssl: true /usr/lib64/

If you see true in the openssl row, Hadoop has detected the right version of and optimization will work.

If you see false in this row, you do not have the correct version.