环境: Centos, Titan-0.5.0-Hadoop2
Titan-hadoop 实现对N_TRIPLES格式的RDF 访问，从dbpedia下载nt格式的文件（例如： http://data.dws.informatik.uni-mannheim.de/dbpedia/2014/zh/labels_en_uris_zh.nt.bz2），编写访问属性文件，如下：
[cloudera@localhost titan-0.5.0-hadoop2]$ vi conf/hadoop/rdf-input.properties
# input graph parameters
titan.hadoop.input.format=com.thinkaurelius.titan.hadoop.formats.edgelist.rdf.RDFInputFormat
titan.hadoop.input.location=examples/labels_en_uris_zh.nt
titan.hadoop.input.conf.format=N_TRIPLES
titan.hadoop.input.conf.as-properties=http://www.w3.org/1999/02/22-rdf-syntax-ns#type
titan.hadoop.input.conf.use-localname=true
titan.hadoop.input.conf.literal-as-property=true
# output data parameters
titan.hadoop.output.format=com.thinkaurelius.titan.hadoop.formats.graphson.GraphSONOutputFormat
titan.hadoop.sideeffect.format=org.apache.hadoop.mapreduce.lib.output.TextOutputFormat
查询数据：
[cloudera@localhost titan-0.5.0-hadoop2]$ gremlin.sh
gremlin> g = HadoopFactory.open(“conf/hadoop/rdf-input.properties”)
gremlin> g.V.map()
……
17:37:12 INFO org.apache.hadoop.mapred.LocalJobRunner – reduce > reduce
17:37:12 INFO org.apache.hadoop.mapred.Task – Task ‘attempt_local1370056218_0005_r_000000_0’ done.
17:37:13 INFO org.apache.hadoop.mapreduce.Job – Job job_local1370056218_0005 completed successfully
17:37:13 INFO org.apache.hadoop.mapreduce.Job – Counters: 35
File System Counters
FILE: Number of bytes read=2911187173
FILE: Number of bytes written=3038059762
FILE: Number of read operations=0
FILE: Number of large read operations=0
FILE: Number of write operations=0
Map-Reduce Framework
Map input records=405909
Map output records=405909
Map output bytes=65118176
Map output materialized bytes=66297322
Input split bytes=268
Combine input records=405909
Combine output records=405909
Reduce input groups=405909
Reduce shuffle bytes=0
Reduce input records=405909
Reduce output records=0
Spilled Records=811818
Shuffled Maps =0
Failed Shuffles=0
Merged Map outputs=0
GC time elapsed (ms)=5136
CPU time spent (ms)=0
Physical memory (bytes) snapshot=0
Virtual memory (bytes) snapshot=0
Total committed heap usage (bytes)=2091909120
com.thinkaurelius.titan.hadoop.formats.edgelist.EdgeListInputMapReduce$Counters
IN_EDGES_CREATED=0
OUT_EDGES_CREATED=0
VERTEX_PROPERTIES_CREATED=1217727
VERTICES_CREATED=405909
VERTICES_EMITTED=405909
com.thinkaurelius.titan.hadoop.mapreduce.transform.PropertyMapMap$Counters
VERTICES_PROCESSED=405909
com.thinkaurelius.titan.hadoop.mapreduce.transform.VerticesMap$Counters
EDGES_PROCESSED=0
VERTICES_PROCESSED=405909
File Input Format Counters
Bytes Read=54114517
File Output Format Counters
Bytes Written=0
==>47994559900176 {label_=[慾望], _id=[47994559900176], name=[Want], uri=[http://dbpedia.org/resource/Want]}
==>60888991522182 {label_=[无机化学命名法], _id=[60888991522182], name=[IUPAC_nomenclature_of_inorganic_chemistry], uri=[http://dbpedia.org/resource/IUPAC_nomenclature_of_inorganic_chemistry]}
==>78841791384159 {label_=[诺伊斯塔特-格莱韦], _id=[78841791384159], name=[Neustadt-Glewe], uri=[http://dbpedia.org/resource/Neustadt-Glewe]}
==>78961407639797 {label_=[打狗英國領事館文化園區], _id=[78961407639797], name=[Former_British_Consulate_at_Takao], uri=[http://dbpedia.org/resource/Former_British_Consulate_at_Takao]}
==>95522075072286 {label_=[賴琳恩], _id=[95522075072286], name=[Lene_Lai], uri=[http://dbpedia.org/resource/Lene_Lai]}
==>153451821264409 {label_=[唐古韭], _id=[153451821264409], name=[Allium_tanguticum], uri=[http://dbpedia.org/resource/Allium_tanguticum]}
==>154857715280524 {label_=[温带], _id=[154857715280524], name=[Temperate_climate], uri=[http://dbpedia.org/resource/Temperate_climate]}
==>166027168671115 {label_=[GSh-18手槍], _id=[166027168671115], name=[GSh-18], uri=[http://dbpedia.org/resource/GSh-18]}
==>166513572484984 {label_=[WMA], _id=[166513572484984], name=[WMA], uri=[http://dbpedia.org/resource/WMA]}
==>182078824443170 {label_=[保罗·纳斯], _id=[182078824443170], name=[Paul_Nurse], uri=[http://dbpedia.org/resource/Paul_Nurse]}
==>211356647821663 {label_=[克魯克斯頓 (明尼蘇達州)], _id=[211356647821663], name=[Crookston,_Minnesota], uri=[http://dbpedia.org/resource/Crookston,_Minnesota]}
==>222227245802710 {label_=[我的女友是九尾狐], _id=[222227245802710], name=[My_Girlfriend_Is_a_Nine-Tailed_Fox], uri=[http://dbpedia.org/resource/My_Girlfriend_Is_a_Nine-Tailed_Fox]}
==>229972043766751 {label_=[李天荣], _id=[229972043766751], name=[Wilson_Lee_Flores], uri=[http://dbpedia.org/resource/Wilson_Lee_Flores]}
==>247488956381743 {label_=[1,2-双(二异丙基膦)乙烷], _id=[247488956381743], name=[1,2-Bis(diisopropylphosphino)ethane], uri=[http://dbpedia.org/resource/1,2-Bis(diisopropylphosphino)ethane]}
==>264200262547493 {label_=[欽迪龍屬], _id=[264200262547493], name=[Chindesaurus], uri=[http://dbpedia.org/resource/Chindesaurus]}
==>…