hadoop ProcessUtils 源码
haddop ProcessUtils 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ProcessUtils.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.hadoop.util;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* Process related utilities.
*/
@InterfaceAudience.Private
public final class ProcessUtils {
private static final Logger LOG = LoggerFactory.getLogger(ProcessUtils.class);
private ProcessUtils() {
// no-op
}
public static Integer getPid() {
// JVM_PID can be exported in service start script
String pidStr = System.getenv("JVM_PID");
// In case if it is not set correctly, fallback to mxbean which is implementation specific.
if (pidStr == null || pidStr.trim().isEmpty()) {
String name = ManagementFactory.getRuntimeMXBean().getName();
if (name != null) {
int idx = name.indexOf("@");
if (idx != -1) {
pidStr = name.substring(0, name.indexOf("@"));
}
}
}
try {
if (pidStr != null) {
return Integer.valueOf(pidStr);
}
} catch (NumberFormatException ignored) {
// ignore
}
return null;
}
public static Process runCmdAsync(List<String> cmd) {
try {
LOG.info("Running command async: {}", cmd);
return new ProcessBuilder(cmd).inheritIO().start();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
}
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