001/* 002 * Copyright (c) 2007-2017 Xplenty, Inc. All Rights Reserved. 003 * 004 * Project and contact information: http://www.cascading.org/ 005 * 006 * This file is part of the Cascading project. 007 * 008 * Licensed under the Apache License, Version 2.0 (the "License"); 009 * you may not use this file except in compliance with the License. 010 * You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, software 015 * distributed under the License is distributed on an "AS IS" BASIS, 016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 017 * See the License for the specific language governing permissions and 018 * limitations under the License. 019 */ 020 021package cascading.tap.hadoop; 022 023import java.io.IOException; 024import java.net.URI; 025import java.util.ArrayList; 026import java.util.Collection; 027 028import cascading.flow.FlowProcess; 029import cascading.tap.Tap; 030import cascading.tap.TapException; 031import org.apache.hadoop.conf.Configuration; 032import org.apache.hadoop.fs.Path; 033import org.apache.hadoop.mapred.OutputCollector; 034import org.apache.hadoop.mapred.RecordReader; 035 036/** 037 * 038 */ 039public class DistCacheTap extends BaseDistCacheTap 040 { 041 public static final String CASCADING_LOCAL_RESOURCES = "cascading.resources.local."; 042 public static final String CASCADING_REMOTE_RESOURCES = "cascading.resources.remote."; 043 044 public DistCacheTap( Tap<Configuration, RecordReader, OutputCollector> original ) 045 { 046 super( original ); 047 } 048 049 @Override 050 protected Path[] getLocalCacheFiles( FlowProcess<? extends Configuration> flowProcess ) throws IOException 051 { 052 String key = CASCADING_REMOTE_RESOURCES + Tap.id( this ); 053 String property = flowProcess.getStringProperty( key ); 054 055 if( property == null ) 056 throw new TapException( "unable to find local resources property for: " + key ); 057 058 String[] split = property.split( "," ); 059 Path[] paths = new Path[ split.length ]; 060 061 for( int i = 0; i < split.length; i++ ) 062 paths[ i ] = new Path( split[ i ] ); 063 064 return paths; 065 } 066 067 @Override 068 protected void addLocalCacheFiles( Configuration conf, URI uri ) 069 { 070 String key = CASCADING_LOCAL_RESOURCES + Tap.id( this ); 071 Collection<String> resources = conf.getStringCollection( key ); 072 073 if( resources == null ) 074 resources = new ArrayList<>(); 075 076 resources.add( uri.toString() ); 077 078 conf.setStrings( key, resources.toArray( new String[ resources.size() ] ) ); 079 } 080 }