Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/8880#discussion_r76452481
--- Diff: docs/configuration.md ---
@@ -559,6 +559,39 @@ Apart from these, the following properties are also
available, and may be useful
<code>spark.io.compression.codec</code>.
</td>
</tr>
+<tr>
+ <td><code>spark.io.encryption.enabled</code></td>
+ <td>false</td>
+ <td>
+ Enable IO encryption. It only supports YARN mode.
+ </td>
+</tr>
+<tr>
+ <td><code>spark.io.encryption.keySizeBits</code></td>
+ <td>128</td>
+ <td>
+ IO encryption key size in bits. The valid number includes 128, 192 and
256.
+ </td>
+</tr>
+<tr>
+ <td><code>spark.io.encryption.keygen.algorithm</code></td>
+ <td>HmacSHA1</td>
+ <td>
+ The algorithm to generate the key used by IO encryption. The supported
algorithms are
+ described in the KeyGenerator section of the Java Cryptography
Architecture Standard Algorithm
+ Name Documentation.
+ </td>
+</tr>
+<tr>
+ <td><code>spark.io.crypto.cipher.transformation</code></td>
+ <td>AES/CTR/NoPadding</td>
+ <td>
+ Cipher transformation for IO encryption. The cipher transformation
name is identical to the
+ transformations described in the Cipher section of the Java
Cryptography Architecture
+ Standard Algorithm Name Documentation. Currently only
"AES/CTR/NoPadding" algorithm is
--- End diff --
If only a single value is supported, maybe just not mention this in the
documentation (and mark the config as `.internal()` in the code).
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