badaiaqrandista commented on code in PR #12416:
URL: https://github.com/apache/kafka/pull/12416#discussion_r927123679
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core/src/test/scala/unit/kafka/network/SocketServerTest.scala:
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@@ -1878,6 +1878,98 @@ class SocketServerTest {
}, false)
}
+ /**
+ * Tests for KAFKA-13559 - Processing request got delayed by 300 ms in the
following condition:
+ * 1. Client-Server communication uses SSL socket.
+ * 2. More than one requests are read from the socket into
SslTransportLayer.netReadBuffer.
+ *
+ * This 300 ms delay occurs because the socket has no data but the buffer
has data. And the sequence of events that
+ * leads to this situation is the following (from the server point of view):
+ *
+ * Step 1 - SslTransportLayer receives more than one requests in the socket
and put it in the buffer
+ * (SslTransportLayer.netReadBuffer).
+ * Step 2 - SslTransportLayer reads all of the bytes and stores it in
SslTransportLayer.appReadBuffer.
+ * Step 3 - Process the first request, leaving the second request in
SslTransportLayer.appReadBuffer.
+ * Step 4 - THIS IS WHERE THE DELAY IS. Process the second request. This
request is read from
+ * SslTransportLayer.appReadBuffer, instead of the socket. Because of this,
"select(timeout)" in Selector.poll()
+ * should not block for 300 ms.
+ *
+ * This test is implemented following "makeSocketWithBufferedRequests()"
method by putting two requests directly
+ * into SslTransportLayer.netReadBuffer and manually trigger the processing.
+ *
+ */
+ @Test
+ def testLatencyWithBufferedDataAndNoSocketData(): Unit = {
+ shutdownServerAndMetrics(server)
+
+ // create server with SSL listener
+ val testableServer = new
TestableSocketServer(KafkaConfig.fromProps(sslServerProps))
+ testableServer.enableRequestProcessing(Map.empty)
+ val testableSelector = testableServer.testableSelector
+ val proxyServer = new ProxyServer(testableServer)
+ val selectTimeout = 5000 // in ms
+ // set pollTimeoutOverride to "selectTimeout" to ensure poll() timeout is
distinct and can be identified
+ testableSelector.pollTimeoutOverride = Some(selectTimeout)
+
+ try {
+ // trigger SSL handshake by sending the first request and receiving its
response without buffering
+ val requestBytes = producerRequestBytes()
+ val sslSocket = sslClientSocket(proxyServer.localPort)
+
+ sendRequest(sslSocket, requestBytes)
+ val request1 = receiveRequest(testableServer.dataPlaneRequestChannel)
+ processRequest(testableServer.dataPlaneRequestChannel, request1)
+ receiveResponse(sslSocket)
+
+ // then put 2 requests in SslTransportLayer.netReadBuffer via the
ProxyServer
+ val connectionId = request1.context.connectionId
+ val listener =
testableServer.config.dataPlaneListeners.head.listenerName.value
+ val channel =
testableServer.dataPlaneAcceptor(listener).get.processors(0).channel(connectionId).getOrElse(throw
new IllegalStateException("Channel not found"))
+ val transportLayer: SslTransportLayer = JTestUtils.fieldValue(channel,
classOf[KafkaChannel], "transportLayer")
+ val netReadBuffer: ByteBuffer = JTestUtils.fieldValue(transportLayer,
classOf[SslTransportLayer], "netReadBuffer")
+
+ proxyServer.enableBuffering(netReadBuffer)
+ sendRequest(sslSocket, requestBytes)
+ sendRequest(sslSocket, requestBytes)
+
+ val keysWithBufferedRead: util.Set[SelectionKey] =
JTestUtils.fieldValue(testableSelector, classOf[Selector],
"keysWithBufferedRead")
+ keysWithBufferedRead.add(channel.selectionKey)
+ JTestUtils.setFieldValue(transportLayer, "hasBytesBuffered", true)
+
+ // process the first request in the server side
+ // this would move bytes from netReadBuffer to appReadBuffer, then
process only the first request
+ // we call wakeup() so Selector.poll() does not block in this step
(because we artificially add data into netReadBuffer)
+ testableSelector.wakeup()
+ val req1 = receiveRequest(testableServer.dataPlaneRequestChannel,
selectTimeout + 1000)
+ processRequest(testableServer.dataPlaneRequestChannel, req1)
+
+ // receive response in the client side
+ receiveResponse(sslSocket)
+
+ // process the second request in the server side
+ // this would process the second request in the appReadBuffer
+ // NOTE 1: this should not block because the data is already in the
buffer, but without the fix for KAFKA-13559,
+ // this step will block for 300 ms (in this test, we override poll()
timeout to 5000 ms to make it distinct)
+ // NOTE 2: we do not call wakeup() here so Selector.poll() would block
if the fix is not in place
+ val processTimeStart = System.nanoTime() // using nanoTime() because it
is meant to calculate elapsed time
+ val req2 = receiveRequest(testableServer.dataPlaneRequestChannel,
selectTimeout + 1000)
+ processRequest(testableServer.dataPlaneRequestChannel, req2)
Review Comment:
Got it. Removing this line.
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