– programming ASSINGMENT FOR HADOOP BIG DATA , MAPREDUCE , I WILLDescriptionSolution downloadThe…

– programming ASSINGMENT FOR HADOOP BIG DATA , MAPREDUCE , I WILLDescriptionSolution downloadThe Questionprogramming ASSINGMENT FOR HADOOP BIG DATA , MAPREDUCE , I WILL UPLOAD THE FILESMapReduceby Chen SunReference? Hadoop Streaming? https://hadoop.apache.org/docs/r2.7.2/hadoopstreaming/HadoopStreaming.html? MapReduce Tutorial? https://hadoop.apache.org/docs/r2.7.2/hadoop-mapreduce-client/hadoopmapreduce-client-core/MapReduceTutorial.html? API? https://hadoop.apache.org/docs/r2.7.2/api/index.html?org/apache/hadoop/MapReduceMapReduce? MapReduce is a programming model for data processing.? Hadoop can run MapReduce programs written in various languages.Data Flow in MapReduce? There are two types of nodes that control the job execution process:a jobtracker and a number of tasktrackers.? The jobtracker coordinates all the jobs run on the system(cluster) byscheduling tasks to run on tasktrackers.? Tasktrackers run tasks and send progress reports to the jobtracker,which keeps a record of the overall progress of each job. If a task fails,the jobtracker can reschedule it on a different tasktracker.Data Flow in MapReduce? MapReduce job is a unit of work that the client wants to beperformed: it consists of the input data, the MapReduce program,and configuration information.? Hadoop runs the job by dividing it into tasks, of which there are twotypes: map tasks and reduce tasks.Map Task & Input? Hadoop divides the input to a MapReduce job into fixed-size piecescalled input splits, or just splits. Hadoop creates one map task foreach split, which runs the user-defined map function for each recordin the split.Reduce Task? Reduce task could be one, many or none. It’s possible to have zeroreduce tasks. This can be appropriate when you don’t need theshuffle because the processing can be carried out entirely in parallel.Example of Data Flow in MapReduce:Find Max TemperatureMapReduce Programming? How to write a program actually do the job in last example?MapperMapReduce Programming? The Mapper class is a generic type, with four formal type parametersthat specify the input key, input value, output key, and output valuetypes of the map function.? Rather than using built-in Java types, Hadoop provides its own set ofbasic types that are optimized for network serialization. These arefound in the org.apache.hadoop.io package.MapReduce Programming? The map() method is passed a key and a value. We convert the Textvalue containing the line of input into a Java String, then use itssubstring() method to extract the columns we are interested in.? The map() method also provides an instance of Context to write theoutput to. In this case, we write the year as a Text object (since weare just using it as a key), and the temperature is wrapped in anIntWritable.ReducerMapReduce Programming? Four formal type parameters are used to specify the input and outputtypes, this time for the reduce function.? The input types of the reduce function must match the output typesof the map function, in this case, Text and IntWritable.Main FunctionMapReduce Programming? A Job object forms the specification of the job and gives you controlover how the job is run. When we run this job on a Hadoop cluster,we will package the code into a JAR file (which Hadoop will distributearound the cluster).MapReduce Programming? An input path is specified by calling the static addInputPath() methodon FileInputFormat, and it can be a single file, a directory (in whichcase, the input forms all the files in that directory). As the namesuggests, addInputPath() can be called more than once to use inputfrom multiple paths.? The output path (of which there is only one) is specified b

 

Do you need a similar assignment done for you from scratch? We have qualified writers to help you. We assure you an A+ quality paper that is free from plagiarism. Order now for an Amazing Discount!
Use Discount Code “Newclient” for a 15% Discount!

NB: We do not resell papers. Upon ordering, we do an original paper exclusively for you.

The post – programming ASSINGMENT FOR HADOOP BIG DATA , MAPREDUCE , I WILLDescriptionSolution downloadThe… appeared first on Affordable Nursing Writers.