| /* |
| * 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.chaos.remote |
| |
| import org.apache.hadoop.conf.Configured |
| |
| /** |
| * |
| */ |
| class BuildPidPath extends Configured { |
| |
| public static final String PID_DIR = "/var/run/hadoop" |
| |
| |
| String buildPidName(String user, String service) { |
| "${user}-${service}" |
| } |
| |
| File buildPidPath(String pidName) { |
| new File(PID_DIR, "hadoop-${pidName}.pid") |
| } |
| |
| /** |
| * Find the Pid string value of a hadoop process |
| * @param user user ID |
| * @param service |
| * @return the pid as a string or null for none found. If the string |
| * is empty it means the pid file was empty -there's no validation of |
| * it. |
| */ |
| String findPid(String pidName) { |
| File pidFile = buildPidPath(pidName) |
| if (!pidFile.exists()) { |
| return null |
| } else { |
| return pidFile.text.trim() |
| } |
| } |
| } |