Spark API编程动手实战-02-以集群模式进行Spark API实战textFile、cach

标签：

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)
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(Sections,1)
(fee,1)
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(4.,1)
(file,6)
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("[]",1)
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(CONTRIBUTORS,4)
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(IMPLIED,4)
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("printed,1)
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(:,3)
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((http://www.one-lab.org),1)
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(http://code.google.com/p/lz4/,1)
(modification,,2)
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(Works,12)
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("AS,4)
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("NOTICE",1)
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(limited,4)
(LZ4,3)
(2008,2009,2010,1)
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(contents,1)
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("Contribution",1)
(failure,1)
(communication,3)
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(WARRANTIES,4)
(media,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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(ADVISED,2)
((a),1)
(other,9)
(date,1)
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(LIMITED,4)
(display,,1)
(MERCHANTABILITY,2)
(damages,3)
(SUBCOMPONENTS:,1)
(negligence),,1)
(remain,1)
(CONDITIONS,4)
(their,2)
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(trade,1)
(third-party,2)
(,1299)
(description,1)
(REPRODUCTION,,1)
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(INDIRECT,,2)
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(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)
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(goodwill,,1)
(herein,1)
(direct,,1)
(used,1)
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(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)
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(thereof,,2)
(ARISING,2)
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(but,5)
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(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)
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("control",1)
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("Object",1)
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("Work",1)
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(SPECIAL,,2)
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((b),1)
((ii),1)
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((INCLUDING,2)
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("submitted",1)
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(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)
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(bind,1)
((the,1)
(indemnity,,1)
(distribute,3)
(You,24)
(grants,2)
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(meet,1)
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(service,1)
(in,31)
(trademark,,1)
(boilerplate,1)
(WAY,2)
(LOSS,2)
(distributed,3)
(LIABILITY,,4)
(submitted,2)
(public,1)
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(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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(permission.,1)
("License");,1)
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(http://www.apache.org/licenses/,1)
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((such,1)
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(-,7)
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(medium,,1)
(within,8)
(worldwide,,2)
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(files.,1)
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(you,2)
(POSSIBILITY,2)
(cannot,1)
(copies,1)
(a,21)
(statement,1)
(above,4)
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(by,,3)
(to,41)
(appear.,1)
(Your,9)
(where,1)
(liability.,1)
(governing,1)
(NOT,4)
(License,,6)
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(copyright,15)
(USE,,3)
(compliance,1)
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(comment,1)
(additional,4)
(executed,1)
(mechanical,1)
(Contributor,8)
[spark@S1PA222 ~]$

Spark API编程动手实战-02-以集群模式进行Spark API实战textFile、cach

标签：

原文地址：http://my.oschina.net/u/230960/blog/372670