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_r269397696
##########
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
Review comment:
This doc is confusing me a bit (haven't looked at the impl yet). It seems
this both reads and writes to the same buf, but the read is happening from the
'start' whereas the write is happening at 'buf.position()'? That seems somewhat
unexpected and opens up some questions about whether the output range and input
range can overlap
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