操作HDFS：先要保证HDFS启动了：
启动spark集群：
以spark-shell运行在spark集群上：
查看下之前上传到HDFS上的”LICENSE.txt“文件：
用spark读取这个文件：
使用count统计该文件的行数：
我们可以看到count 耗时为0.239708s
对该RDD进行cache操作并执行count使得缓存生效：
执行count结果为：
此时耗时为0.21132s
再执行count操作：
此时耗时为0.029580s，这时因为我们自己基于cache后的数据进行操作的。
接着我们对上面的rdd进行wordcount操作：
通过saveAsTextFile把数据存到HDFS中：
我们通过web控制台查看下运行结果：
我们通过命令行看下part-00000和part-00001内容：
[spark@S1PA222 ~]$ hadoop fs -cat /data/resultLicenseWordCount/part-00000
15/01/22 13:51:32 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
(under,10)
(Unless,3)
(Contributions),1)
(offer,1)
(agree,1)
(BUSINESS,2)
(NON-INFRINGEMENT,,1)
(its,4)
(materials,2)
(event,1)
(intentionally,2)
(Grant,2)
(writing,1)
(include,3)
(responsibility,,1)
(have,2)
(MERCHANTABILITY,,1)
(Contribution,3)
(Massachusetts,1)
(express,2)
("Your"),1)
((i),1)
(However,,1)
(been,2)
(files;,1)
(This,1)
(stating,1)
(2-Clause,1)
(conditions.,1)
(non-exclusive,,2)
(appropriateness,1)
(marked,1)
(risks,1)
(any,28)
(IS",4)
(implementation,1)
(filed.,1)
(Sections,1)
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(losses),,1)
(out,1)
(contract,2)
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(4.,1)
(file,6)
(documentation,,2)
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(below).,1)
(names,,1)
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(ANY,10)
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("[]",1)
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(CONTRIBUTORS,4)
(as,15)
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(Definitions.,1)
(form,10)
(IMPLIED,4)
(Warranty,1)
(Patent,1)
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(8.,1)
(repository,1)
(contributors,1)
("printed,1)
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(:,3)
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(Version,2)
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([name,1)
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(name),1)
(behalf,5)
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(We,1)
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(OUT,2)
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(University,1)
([yyyy],1)
((http://www.one-lab.org),1)
(EVENT,2)
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(NOTICE,5)
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(names,2)
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(EVEN,2)
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(information.,1)
(litigation,2)
(represent,,1)
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(marks,,1)
(http://code.google.com/p/lz4/,1)
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(fifty,1)
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(identifying,1)
(this,22)
(Works",1)
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(PROCUREMENT,2)
(changed,1)
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(WITHOUT,2)
(Works,12)
(documentation,3)
(agreement,1)
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("AS,4)
(damages,,1)
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(APACHE,1)
(without,6)
("NOTICE",1)
(Limitation,1)
(SUBSTITUTE,2)
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(Subject,2)
(Submission,1)
(UCL,1)
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(trademarks,,1)
((iii),1)
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(distribution.,2)
(interfaces,1)
(conditions:,1)
(act,1)
(incorporated,2)
(provides,2)
(limited,4)
(LZ4,3)
(2008,2009,2010,1)
(can,2)
(contents,1)
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("Contribution",1)
(failure,1)
(communication,3)
(commercial,1)
(works,1)
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(permissions,3)
(WARRANTIES,4)
(media,1)
(reserved.,2)
(Works,,2)
(How,1)
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(2.0,,1)
((http://www.opensource.org/licenses/bsd-license.php),1)
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((c),2)
(src/main/native/src/org/apache/hadoop/util:,1)
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(subcomponents,2)
(modify,2)
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(counterclaim,1)
(January,1)
(discussing,1)
(CONTRACT,,2)
(with,16)
((C),1)
(infringement,,1)
(2004,1)
(lawsuit),1)
(specific,2)
(LZ,1)
(warranties,1)
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(promote,1)
(beneficial,1)
(ADVISED,2)
((a),1)
(other,9)
(date,1)
(met:,2)
(publicly,2)
(from,4)
(LIMITED,4)
(display,,1)
(MERCHANTABILITY,2)
(damages,3)
(SUBCOMPONENTS:,1)
(negligence),,1)
(remain,1)
(CONDITIONS,4)
(their,2)
(electronic,1)
(identification,1)
(determining,1)
(consistent,1)
(display,1)
(writing,,3)
(trade,1)
(third-party,2)
(,1299)
(description,1)
(REPRODUCTION,,1)
(attached,1)
(list,4)
(*,34)
(INDIRECT,,2)
(designated,1)
(Contribution.",1)
(complies,1)
(addendum,1)
(damages.,1)
(Yann,1)
(EXPRESS,2)
(License;,1)
(6.,1)
(GOODS,2)
(subsequently,1)
(included,2)
(replaced,1)
(notice,,5)
[spark@S1PA222 ~]$ hadoop fs -cat /data/resultLicenseWordCount/part-00001
15/01/22 13:52:29 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
(For,6)
(reproduce,,1)
("Contributor",1)
((or,3)
(nothing,1)
(work.,1)
(content,1)
(HOLDERS,2)
(add,2)
(through,1)
(All,2)
(perform,,1)
(result,1)
(goodwill,,1)
(herein,1)
(direct,,1)
(used,1)
(To,1)
(harmless,1)
(9.,1)
(these,1)
(control,,1)
(INCIDENTAL,,2)
(indicated,1)
(part,4)
(alone,1)
(different,1)
(forms,,2)
(purposes,4)
(https://groups.google.com/forum/#!forum/lz4c,1)
(be,7)
(/**,2)
(carry,1)
(separable,1)
(including,5)
(contained,1)
(combination,1)
(calculation,1)
(license,7)
(FOR,6)
(thereof,,2)
(ARISING,2)
(constitutes,1)
(but,5)
(types.,1)
(stated,2)
(archives.,1)
(obligations,,1)
(5.,1)
(Works;,3)
(nor,1)
("Legal,1)
(Work,20)
(whole,,2)
(Copyright,5)
(at,3)
(copyright,,1)
(Redistribution,2)
(object,1)
(copy,3)
(indemnify,,1)
(asserted,1)
(HADOOP,1)
(attach,1)
("control",1)
(support,,1)
("Object",1)
(give,1)
(THEORY,2)
(may,10)
(except,2)
("Work",1)
(sublicense,,1)
(IF,2)
(granted,2)
(project,2)
(authorized,2)
(SPECIAL,,2)
(BY,2)
(retain,2)
(or,65)
(transfer,1)
(fields,1)
(Licensor,,1)
((b),1)
((ii),1)
(2005,,1)
(of,75)
(does,1)
(transformation,1)
((INCLUDING,2)
(DIRECT,,2)
(management,1)
(modified,1)
(Licensed,1)
(percent,1)
(Header,1)
(original,2)
(Contributor,,1)
(native,1)
((INCLUDING,,2)
(PARTICULAR,3)
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(THE,10)
(INCLUDING,,2)
(power,,1)
(CAUSED,2)
(de,1)
(appropriate,1)
(against,,1)
(TORT,2)
("Source",1)
(each,4)
(1.,1)
(following,10)
(Liability.,2)
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("You",1)
(sole,1)
(from),1)
(See,1)
(tracking,1)
(for,19)
(cause,2)
(alleging,1)
(obtain,1)
(reproduce,3)
(source,,1)
(control,2)
(EXEMPLARY,,2)
(TERMS,2)
(terms,8)
(syntax,1)
(SERVICES;,2)
(made,,1)
(BUT,4)
(compiled,1)
(issue,1)
("submitted",1)
(OneLab,1)
(algorithm,1)
(was,1)
(While,1)
(entity,,1)
(do,3)
(PROVIDED,2)
(no,2)
(License,10)
(entity,3)
(Contributions.,2)
(mean,10)
(individual,3)
(Institute,1)
(computer,1)
(notices,9)
(Neither,1)
(Licensor,8)
(STRICT,2)
(made,1)
(authorship,,2)
(bind,1)
((the,1)
(indemnity,,1)
(distribute,3)
(You,24)
(grants,2)
(brackets,1)
(meet,1)
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(service,1)
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(trademark,,1)
(boilerplate,1)
(WAY,2)
(LOSS,2)
(distributed,3)
(LIABILITY,,4)
(submitted,2)
(public,1)
(OF,19)
(managed,1)
(derived,2)
(Source,8)
(use,,4)
(name,2)
(definition,,2)
(that,25)
(src/main/native/src/org/apache/hadoop/io/compress/lz4/{lz4.h,lz4.c,lz4hc.h,lz4hc.c},,1)
(customary,1)
(BSD,1)
(thereof,1)
(claims,2)
(CONSEQUENTIAL,2)
(translation,1)
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(WHETHER,2)
(page",1)
((except,1)
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(hereby,2)
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(software,3)
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(required,4)
(OR,18)
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(SOFTWARE,2)
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(all,3)
(permission.,1)
("License");,1)
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(generated,2)
(consequential,1)
(Derivative,17)
(AND,11)
(rights,3)
(http://www.apache.org/licenses/,1)
(terms.,1)
(Catholique,1)
(deliberate,1)
(entity.,2)
(Work,,4)
(special,,1)
(Additional,1)
(Legal,3)
(034819,1)
(least,1)
(text,4)
(on,11)
(editorial,1)
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("License",1)
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(enclosed,2)
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(owner.,1)
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(modifications,3)
(brackets!),1)
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(code,5)
(http://www.apache.org/licenses/LICENSE-2.0,1)
(more,1)
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((an,1)
(APPENDIX:,1)
("Licensor",1)
(DISCLAIMED.,2)
("Derivative,1)
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(incidental,,1)
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(A,3)
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(3.,1)
(also,1)
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(liability,2)
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(your,4)
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(entities,1)
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(NEGLIGENCE,2)
(author,1)
("Not,1)
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((including,3)
(Redistribution.,1)
(attribution,4)
(by,21)
(TO,,4)
(defined,1)
(OWNER,2)
(If,2)
(an,6)
(/*,1)
(Collet.,1)
(improving,1)
(grossly,1)
(COPYRIGHT,4)
(above,,1)
(theory,,1)
(mailing,1)
(7.,1)
(Notwithstanding,1)
(code,,2)
(cross-claim,1)
(provide,1)
((such,1)
(arising,1)
(Object,4)
(In,1)
(-,7)
(those,3)
(work,,2)
(easier,1)
(based,1)
(medium,,1)
(within,8)
(worldwide,,2)
(authorship.,1)
(files.,1)
(inability,1)
(you,2)
(POSSIBILITY,2)
(cannot,1)
(copies,1)
(a,21)
(statement,1)
(above,4)
(state,1)
(work,5)
(by,,3)
(to,41)
(appear.,1)
(Your,9)
(where,1)
(liability.,1)
(governing,1)
(NOT,4)
(License,,6)
(hold,1)
(and,51)
(copyright,15)
(USE,,3)
(compliance,1)
(SOFTWARE,,2)
(comment,1)
(additional,4)
(executed,1)
(mechanical,1)
(Contributor,8)
[spark@S1PA222 ~]$