spark InProcessAppHandle 源码
spark InProcessAppHandle 代码
文件路径：/launcher/src/main/java/org/apache/spark/launcher/InProcessAppHandle.java
/*
* 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.spark.launcher;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Level;
import java.util.logging.Logger;
class InProcessAppHandle extends AbstractAppHandle {
private static final String THREAD_NAME_FMT = "spark-app-%d: '%s'";
private static final Logger LOG = Logger.getLogger(InProcessAppHandle.class.getName());
private static final AtomicLong THREAD_IDS = new AtomicLong();
// Avoid really long thread names.
private static final int MAX_APP_NAME_LEN = 16;
private volatile Throwable error;
private Thread app;
InProcessAppHandle(LauncherServer server) {
super(server);
}
@Override
public synchronized void kill() {
if (!isDisposed()) {
LOG.warning("kill() may leave the underlying app running in in-process mode.");
setState(State.KILLED);
disconnect();
// Interrupt the thread. This is not guaranteed to kill the app, though.
if (app != null) {
app.interrupt();
}
}
}
@Override
public Optional<Throwable> getError() {
return Optional.ofNullable(error);
}
synchronized void start(String appName, Method main, String[] args) {
CommandBuilderUtils.checkState(app == null, "Handle already started.");
if (appName.length() > MAX_APP_NAME_LEN) {
appName = "..." + appName.substring(appName.length() - MAX_APP_NAME_LEN);
}
app = new Thread(() -> {
try {
main.invoke(null, (Object) args);
} catch (Throwable t) {
if (t instanceof InvocationTargetException) {
t = t.getCause();
}
LOG.log(Level.WARNING, "Application failed with exception.", t);
error = t;
setState(State.FAILED);
}
dispose();
});
app.setName(String.format(THREAD_NAME_FMT, THREAD_IDS.incrementAndGet(), appName));
app.start();
}
}
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