/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.avro.ipc.stats;
import java.io.IOException;
import java.net.URL;
import org.apache.avro.Protocol;
import org.apache.avro.Protocol.Message;
import org.apache.avro.generic.GenericRequestor;
import org.apache.avro.generic.GenericResponder;
import org.apache.avro.ipc.AvroRemoteException;
import org.apache.avro.ipc.HttpServer;
import org.apache.avro.ipc.HttpTransceiver;
import org.apache.avro.ipc.Responder;
import org.apache.avro.ipc.Transceiver;
/**
* Naively measures overhead of using the stats plugin.
*
* The API used is the generic one.
* The protocol is the "null" protocol: null is sent
* and returned.
*/
public class StatsPluginOverhead {
/** Number of RPCs per iteration. */
private static final int COUNT = 100000;
private static final Protocol NULL_PROTOCOL = Protocol.parse(
"{\"protocol\": \"null\", "
+ "\"messages\": { \"null\": {"
+ " \"request\": [], "
+ " \"response\": \"null\"} } }");
private static class IdentityResponder extends GenericResponder {
public IdentityResponder(Protocol local) {
super(local);
}
@Override
public Object respond(Message message, Object request)
throws AvroRemoteException {
return request;
}
}
public static void main(String[] args) throws Exception {
double with = sendRpcs(true)/1000000000.0;
double without = sendRpcs(false)/1000000000.0;
System.out.println(String.format(
"Overhead: %f%%. RPC/s: %f (with) vs %f (without). " +
"RPC time (ms): %f vs %f",
100*(with - without)/(without),
COUNT/with,
COUNT/without,
1000*with/COUNT,
1000*without/COUNT));
}
/** Sends RPCs and returns nanos elapsed. */
private static long sendRpcs(boolean withPlugin) throws IOException {
HttpServer server = createServer(withPlugin);
Transceiver t =
new HttpTransceiver(new URL("http://127.0.0.1:"+server.getPort()+"/"));
GenericRequestor requestor = new GenericRequestor(NULL_PROTOCOL, t);
long now = System.nanoTime();
for (int i = 0; i < COUNT; ++i) {
requestor.request("null", null);
}
long elapsed = System.nanoTime() - now;
t.close();
server.close();
return elapsed;
}
/** Starts an Avro server. */
private static HttpServer createServer(boolean withPlugin)
throws IOException {
Responder r = new IdentityResponder(NULL_PROTOCOL);
if (withPlugin) {
r.addRPCPlugin(new StatsPlugin());
}
// Start Avro server
HttpServer server = new HttpServer(r, 0);
server.start();
return server;
}
}