toddlipcon 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_r269398123
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/CryptoInputStream.java
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@@ -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:
similar suggestion to above: rename to 'bufPos' for clarity vs file positions
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