/**
* 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.mapred.tether;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.URL;
import java.nio.ByteBuffer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.avro.ipc.HttpServer;
import org.apache.avro.ipc.HttpTransceiver;
import org.apache.avro.ipc.SaslSocketServer;
import org.apache.avro.ipc.SaslSocketTransceiver;
import org.apache.avro.ipc.specific.SpecificRequestor;
import org.apache.avro.ipc.specific.SpecificResponder;
import org.apache.avro.ipc.Server;
/** Java implementation of a tether executable. Useless except for testing,
* since it's already possible to write Java MapReduce programs without
* tethering. Also serves as an example of how a framework may be
* implemented. */
public class TetherTaskRunner implements InputProtocol {
static final Logger LOG = LoggerFactory.getLogger(TetherTaskRunner.class);
private Server inputServer;
private TetherTask task;
private TetheredProcess.Protocol proto;
public TetherTaskRunner(TetherTask task) throws IOException {
this.task = task;
//determine what protocol we are using
String protocol = System.getenv("AVRO_TETHER_PROTOCOL");
if (protocol == null) {
throw new RuntimeException("AVRO_TETHER_PROTOCOL env var is null");
}
protocol=protocol.trim().toLowerCase();
if (protocol.equals("http")) {
LOG.info("Use HTTP protocol");
proto=TetheredProcess.Protocol.HTTP;
} else if (protocol.equals("sasl")) {
LOG.info("Use SASL protocol");
proto=TetheredProcess.Protocol.SASL;
} else {
throw new RuntimeException("AVRO_TETHER_PROTOCOL="+protocol+" but this protocol is unsupported");
}
InetSocketAddress iaddress=new InetSocketAddress(0);
switch(proto) {
case SASL:
// start input server
this.inputServer = new SaslSocketServer
(new SpecificResponder(InputProtocol.class, this),
iaddress);
LOG.info("Started SaslSocketServer on port:"+iaddress.getPort());
break;
case HTTP:
this.inputServer=new HttpServer
(new SpecificResponder(InputProtocol.class, this),
iaddress.getPort());
LOG.info("Started HttpServer on port:"+iaddress.getPort());
break;
}
inputServer.start();
// open output to parent
task.open(inputServer.getPort());
}
@Override public void configure(TaskType taskType,
String inSchema,
String outSchema) {
LOG.info("got configure");
task.configure(taskType, inSchema, outSchema);
}
@Override public synchronized void input(ByteBuffer data, long count) {
task.input(data, count);
}
@Override public void partitions(int partitions) {
task.partitions(partitions);
}
@Override public void abort() {
LOG.info("got abort");
close();
}
@Override public synchronized void complete() {
LOG.info("got input complete");
task.complete();
}
/** Wait for task to complete. */
public void join() throws InterruptedException {
LOG.info("TetherTaskRunner: Start join.");
inputServer.join();
LOG.info("TetherTaskRunner: Finish join.");
}
private void close() {
LOG.info("Closing the task");
task.close();
LOG.info("Finished closing the task.");
if (inputServer != null)
inputServer.close();
}
}