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From GitBox <...@apache.org>
Subject [GitHub] [hadoop] sahilTakiar commented on a change in pull request #597: HDFS-3246: pRead equivalent for direct read path
Date Mon, 01 Apr 2019 23:34:11 GMT
sahilTakiar commented on a change in pull request #597: HDFS-3246: pRead equivalent for direct
read path
URL: https://github.com/apache/hadoop/pull/597#discussion_r271087894
 
 

 ##########
 File path: hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/CryptoInputStream.java
 ##########
 @@ -375,7 +399,72 @@ private void decrypt(long position, byte[] buffer, int offset, int length)
       returnDecryptor(decryptor);
     }
   }
-  
+
+  /**
+   * Decrypt n bytes in buf starting at start. Output is also put into buf
+   * starting at current position. buf.position() and buf.limit() should be
+   * unchanged after decryption. It is thread-safe.
+   *
+   * <p>
+   *   This method decrypts the input buf chunk-by-chunk and writes the
+   *   decrypted output back into the input buf. It uses two local buffers
+   *   taken from the {@link #bufferPool} to assist in this process: one is
+   *   designated as the input buffer and it stores a single chunk of the
+   *   given buf, the other is designated as the output buffer, which stores
+   *   the output of decrypting the input buffer. Both buffers are of size
+   *   {@link #bufferSize}.
+   * </p>
+   *
+   * <p>
+   *   Decryption is done by using a {@link Decryptor} and the
+   *   {@link #decrypt(Decryptor, ByteBuffer, ByteBuffer, byte)} method. Once
+   *   the decrypted data is written into the output buffer, is is copied back
+   *   into buf. Both buffers are returned back into the pool once the entire
+   *   buf is decrypted.
+   * </p>
+   */
+  private void decrypt(long position, ByteBuffer buf, int n, int start)
+          throws IOException {
+    ByteBuffer localInBuffer = null;
+    ByteBuffer localOutBuffer = null;
+    final int pos = buf.position();
 
 Review comment:
   This got removed during some of the other refactoring.

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