001/* 002 * Copyright (c) 2007-2016 Concurrent, 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; 035import org.slf4j.Logger; 036import org.slf4j.LoggerFactory; 037 038/** 039 * 040 */ 041public class DistCacheTap extends BaseDistCacheTap 042 { 043 private static final Logger LOG = LoggerFactory.getLogger( DistCacheTap.class ); 044 045 public static final String CASCADING_LOCAL_RESOURCES = "cascading.resources.local."; 046 public static final String CASCADING_REMOTE_RESOURCES = "cascading.resources.remote."; 047 048 public DistCacheTap( Tap<Configuration, RecordReader, OutputCollector> original ) 049 { 050 super( original ); 051 } 052 053 @Override 054 protected Path[] getLocalCacheFiles( FlowProcess<? extends Configuration> flowProcess ) throws IOException 055 { 056 String key = CASCADING_REMOTE_RESOURCES + Tap.id( this ); 057 String property = flowProcess.getStringProperty( key ); 058 059 if( property == null ) 060 throw new TapException( "unable to find local resources property for: " + key ); 061 062 String[] split = property.split( "," ); 063 Path[] paths = new Path[ split.length ]; 064 065 for( int i = 0; i < split.length; i++ ) 066 paths[ i ] = new Path( split[ i ] ); 067 068 return paths; 069 } 070 071 @Override 072 protected void addLocalCacheFiles( Configuration conf, URI uri ) 073 { 074 String key = CASCADING_LOCAL_RESOURCES + Tap.id( this ); 075 Collection<String> resources = conf.getStringCollection( key ); 076 077 if( resources == null ) 078 resources = new ArrayList<>(); 079 080 resources.add( uri.toString() ); 081 082 conf.setStrings( key, resources.toArray( new String[ resources.size() ] ) ); 083 } 084 }