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Spark Programming Language Download Pdf

 
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MessagePosté le: Mar 11 Oct - 16:58 (2016)    Sujet du message: Spark Programming Language Download Pdf Répondre en citant




Spark Programming Language Download Pdf > bit.ly/2eo6mc9







Spark Programming Language Download Pdf

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Accumulator,,,Integer,,,>,,,accum,,,=,,,sc,,,.,,,Add,,the,,following,,lines:,,import,,org.apache.spark.api.java.JavaSparkContext,,import,,org.apache.spark.api.java.JavaRDD,,import,,org.apache.spark.SparkConf,,Spark,,1.3.0,,works,,with,,Python,,2.6,,or,,higher,,(but,,not,,Python,,3).,,setMaster,,,,(,,,,master,,,,),,,,new,,,,SparkContext,,,,(,,,,conf,,,,),,,,The,,,,first,,,,thing,,,,a,,,,Spark,,,,program,,,,must,,,,do,,,,is,,,,to,,,,create,,,,a,,,,JavaSparkContext,,,,object,,,,,which,,,,tells,,,,Spark,,,,how,,,,to,,,,access,,,,a,,,,cluster.,,,,They,,,,can,,,,be,,,,used,,,,to,,,,implement,,,,counters,,,,(as,,,,in,,,,MapReduce),,,,or,,,,sums.,,,,map,,,(,,,lambda,,,x,,,:,,,(,,,x,,,,,,,"a",,,*,,,x,,,)),,,>>>,,,rdd,,,.,,,conf,,,,=,,,,SparkConf,,,,(),,,,.,,,,You,,,can,,,also,,,use,,,JavaSparkContext.newAPIHadoopRDD,,,for,,,InputFormats,,,based,,,on,,,the,,,new,,,MapReduce,,,API,,,(org.apache.hadoop.mapreduce).,,,We,,describe,,operations,,on,,distributed,,datasets,,later,,on.,,Some,,,notes,,,on,,,reading,,,files,,,with,,,Spark:,,,If,,,using,,,a,,,path,,,on,,,the,,,local,,,filesystem,,,,the,,,file,,,must,,,also,,,be,,,accessible,,,at,,,the,,,same,,,path,,,on,,,worker,,,nodes.,,,Sometimes,,,,a,,,variable,,,needs,,,to,,,be,,,shared,,,across,,,tasks,,,,or,,,between,,,tasks,,,and,,,the,,,driver,,,program.,,,

field,,,=,,,"Hello",,,def,,,doStuff,,,(,,,self,,,,,,,rdd,,,):,,,return,,,rdd,,,.,,,In,,,,addition,,,,,the,,,,object,,,,v,,,,should,,,,not,,,,be,,,,modified,,,,after,,,,it,,,,is,,,,broadcast,,,,in,,,,order,,,,to,,,,ensure,,,,that,,,,all,,,,nodes,,,,get,,,,the,,,,same,,,,value,,,,of,,,,the,,,,broadcast,,,,variable,,,,(e.g.,,,,Accumulator,,,,Integer,,,,>,,,,accum,,,,=,,,,sc,,,,.,,,,While,,much,,of,,this,,guide,,uses,,lambda,,syntax,,for,,conciseness,,,it,,is,,easy,,to,,use,,all,,the,,same,,APIs,,in,,long-form.,,Note:,,,If,,,you,,,are,,,grouping,,,in,,,order,,,to,,,perform,,,an,,,aggregation,,,(such,,,as,,,a,,,sum,,,or,,,average),,,over,,,each,,,key,,,,using,,,reduceByKey,,,or,,,aggregateByKey,,,will,,,yield,,,much,,,better,,,performance.,,,cartesian(otherDataset),,,,When,,,,called,,,,on,,,,datasets,,,,of,,,,types,,,,T,,,,and,,,,U,,,,,returns,,,,a,,,,dataset,,,,of,,,,(T,,,,,U),,,,pairs,,,,(all,,,,pairs,,,,of,,,,elements).,,,,Parallelized,,,,Collections.,,,,

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