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MessagePosté le: Mar 11 Oct - 12:24 (2016)    Sujet du message: Hadoop Mapreduce Architecture Pdf Download Répondre en citant




Hadoop Mapreduce Architecture Pdf Download > shorl.com/grufofegrypebri







Hadoop Mapreduce Architecture Pdf Download

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In,,order,,to,,start,,our,,application,,without,,having,,to,,specify,,the,,main,,class,,on,,the,,command,,line,,,we,,define,,the,,main,,class,,using,,the,,maven-jar-plugin.This,,main,,class,,looks,,like,,the,,following:,,public,,class,,InvertedIndex,,{,,public,,static,,void,,main(String[],,args),,throws,,IOException,,,ClassNotFoundException,,,InterruptedException,,{,,Configuration,,conf,,=,,new,,Configuration();,,Job,,job,,=,,Job.getInstance(conf,,,"inverted,,index");,,job.setJarByClass(InvertedIndex.class);,,job.setMapperClass(InvertedIndexMapper.class);,,job.setCombinerClass(InvertedIndexReducer.class);,,job.setReducerClass(InvertedIndexReducer.class);,,job.setOutputKeyClass(Text.class);,,job.setOutputValueClass(Text.class);,,FileInputFormat.addInputPath(job,,,new,,Path(args[0]));,,FileOutputFormat.setOutputPath(job,,,new,,Path(args[1]));,,System.exit(job.waitForCompletion(true),,?,,0,,:,,1);,,},,},,After,,having,,constructed,,a,,Configuration,,object,,,a,,new,,Job,,instance,,is,,created,,by,,passing,,the,,configuration,,and,,the,,name,,of,,the,,job.,,While,,,MapReduce,,,is,,,a,,,batch,,,framework,,,,applications,,,that,,,want,,,to,,,process,,,large,,,data,,,sets,,,stored,,,in,,,HDFS,,,and,,,immediately,,,inform,,,the,,,user,,,about,,,results,,,cannot,,,be,,,implemented,,,with,,,it.,,,Therefore,,,,the,,,,ApplicationMaster,,,,can,,,,signal,,,,if,,,,it,,,,supports,,,,job,,,,recovery.,,,,For,,,the,,,execution,,,of,,,tasks,,,,each,,,DataNode,,,machine,,,provided,,,a,,,predefined,,,number,,,of,,,slots,,,(map,,,slots,,,,reducers,,,slots).,,,Instead,,,nodes,,,have,,,resources,,,(like,,,memory,,,and,,,CPU,,,cores),,,which,,,can,,,be,,,allocated,,,by,,,applications,,,on,,,a,,,per,,,request,,,basis.,,,This,,way,,MapReduce,,jobs,,can,,run,,together,,with,,non-MapReduce,,jobs,,in,,the,,same,,cluster.Figure,,2:,,YARNThe,,heart,,of,,YARN,,is,,the,,Resource,,Manager,,(RM),,which,,runs,,on,,the,,master,,node,,and,,acts,,as,,a,,global,,resource,,scheduler.,,

The,,,example,,,project,,,contains,,,a,,,few,,,text,,,documents,,,in,,,the,,,folder,,,src/test/resources,,,that,,,can,,,be,,,loaded,,,into,,,the,,,HDFS,,,with,,,the,,,following,,,command:,,,hdfs,,,dfs,,,-put,,,src/test/resources/,,,input,,,This,,,creates,,,a,,,new,,,folder,,,named,,,input,,,in,,,the,,,home,,,directory,,,of,,,the,,,hadoop,,,user,,,(assuming,,,that,,,the,,,command,,,is,,,issued,,,as,,,hadoop,,,user).,,,The,,,,transaction,,,,log,,,,can,,,,then,,,,be,,,,deleted,,,,as,,,,it,,,,has,,,,been,,,,applied,,,,and,,,,its,,,,information,,,,has,,,,been,,,,stored,,,,in,,,,the,,,,latest,,,,FsImage,,,,file.,,,,Instead,,,of,,,relying,,,on,,,expensive,,,fault-tolerant,,,hardware,,,systems,,,,commodity,,,hardware,,,is,,,chosen.,,,This,,,is,,,filled,,,with,,,the,,,available,,,Hadoop,,,resources.,,,Therefore,,we,,create,,a,,simple,,maven,,project,,and,,add,,the,,following,,line,,to,,the,,pom.xml:,,2.7.1,,org.apache.hadoop,,hadoop-client,,${hadoop.version},,maven-assembly-plugin,,ultimate.hdfs.HdfsClient,,jar-with-dependencies,,${project.artifactId}-${project.version},,true,,make-assembly,,package,,single,,The,,lines,,above,,tell,,maven,,to,,use,,version,,2.7.1,,of,,the,,Hadoop,,client,,library.,,JUnit,,,Tutorial,,,for,,,Unit,,,Testing4.,,,Email,,,,address:,,,,Join,,,,Us,,,,With,,,,1,240,600,,,,monthly,,,,unique,,,,visitors,,,,and,,,,over,,,,500,,,,authors,,,,we,,,,are,,,,placed,,,,among,,,,the,,,,top,,,,Java,,,,related,,,,sites,,,,around.,,,,

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