001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.reef.runtime.yarn.driver; 020 021import org.apache.hadoop.yarn.api.records.Container; 022import org.apache.reef.annotations.audience.DriverSide; 023import org.apache.reef.annotations.audience.Private; 024 025import javax.inject.Inject; 026import java.util.logging.Level; 027import java.util.logging.Logger; 028 029/** 030 * Default implementation of rack names formatter. 031 * Extracts rack name from host name, if possible. 032 */ 033@Private 034@DriverSide 035public final class DefaultRackNameFormatter implements RackNameFormatter { 036 037 private static final Logger LOG = Logger.getLogger(DefaultRackNameFormatter.class.getName()); 038 039 @Inject 040 private DefaultRackNameFormatter() { 041 } 042 043 /** 044 * @see RackNameFormatter#getRackName(Container) 045 */ 046 @Override 047 public String getRackName(final Container container) { 048 final String hostName = container.getNodeId().getHost(); 049 050 // the rack name comes as part of the host name, e.g. 051 // <rackName>-<hostNumber> 052 // we perform some checks just in case it doesn't 053 String rackName = null; 054 if (hostName != null) { 055 final String[] rackNameAndNumber = hostName.split("-"); 056 if (rackNameAndNumber.length == 2) { 057 rackName = rackNameAndNumber[0]; 058 } else { 059 LOG.log(Level.WARNING, "Could not get information from the rack name, should use the default"); 060 } 061 } 062 063 return rackName; 064 } 065}