eubnara commented on code in PR #8106:
URL: https://github.com/apache/hadoop/pull/8106#discussion_r2567612919
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hadoop-common-project/hadoop-registry/src/main/java/org/apache/hadoop/registry/server/dns/RegistryDNS.java:
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@@ -805,6 +832,65 @@ public void nioTCPClient(SocketChannel ch) throws
IOException {
}
+ /**
+ * Process a UDP request.
+ *
+ * @param channel the datagram channel for the request.
+ * @param remoteAddress the socket address of client.
+ * @param input the input ByteBuffer.
+ * @throws IOException if the udp processing generates an issue.
+ */
+ public void nioUDPClient(DatagramChannel channel, SocketAddress
remoteAddress, ByteBuffer input) throws IOException {
+ ByteBuffer output = ByteBuffer.allocate(4096);
+ byte[] in = null;
+ byte[] response = null;
+ Message query = null;
+ try {
+ try {
+ int position = input.position();
+ in = new byte[position];
+ input.flip();
+ input.get(in);
+ query = new Message(in);
+ LOG.info("{}: received UDP query {}", remoteAddress,
+ query.getQuestion());
+ response = generateReply(query, null);
+ if (response.length > output.capacity()) {
+ LOG.warn("{}: Response of UDP query {} exceeds limit {}",
+ remoteAddress, query.getQuestion(), output.limit());
+ query.getHeader().setFlag(Flags.TC);
Review Comment:
If the response of UDP query exceeds limit, TC(truncated) flag should be set
in order for the client to request again with TCP query.
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