equals("org.apache.hadoop.mapreduce.Job")) { byte[] bytes = transformJobBytecode(name); if (bytes == null) { ex = new ClassNotFoundException("Transform job bytecode failed."); } else { c = defineClass(name, bytes, 0, bytes.length); } } if (c == null) { // 如果待加载的...
继续New, Java Class, WordCountReducer 代码如下: packagecn.abc.hadoop.mr;importorg.apache.hadoop.io.IntWritable;importorg.apache.hadoop.io.Text;importorg.apache.hadoop.mapreduce.Reducer;importjava.io.IOException;/*** Created by abc * * 这里是MR程序 reducer阶段处理的类 * * KEYIN:就是reducer阶段...
bin/hadoop dfs -ls /user/showmeai/hdfs_in 执行MapReduce job: 代码语言:txt AI代码解释 bin/hadoop jar contrib/streaming/hadoop-*streaming*.jar \ -file ShowMeAI/hadoop/code/mapper.py -mapper ShowMeAI/hadoop/code/mapper.py \ -file ShowMeAI/hadoop/code/reducer.py -reducer ShowMeAI/hadoop...
5.任务的执行:当为任务分配了一个特定节点上的容器,application master就通过与节点管理器通信来启动容器,该任务有主类为YarnChild的一个Java应用程序执行。运行前,首先将任务需要的资源本地化,包括作业的配置,JAR文件和所有来自分布式缓存的文件,最后,运行map任务或reduce任务。 6.任务和状态的更新:MapReduce作业运行...
FileOutputFormat.setOutputPath(job,newPath("D:\\Acode\\Hadoop\\output\\output1"));//7 提交jobbooleanresult=job.waitForCompletion(true); System.exit(result ?0:1); } } 11.8.1.5本地测试 (1)需要首先配置好HADOOP_HOME变量以及Windows运行依赖 ...
System.exit(exitCode); } } 现在就通过Mydriver这个类来同时管理两个mapreduce代码了 我们现在把程序通过maven打包放到大数据集群上面运行一下 在我们的电脑打开cmd窗口,切换到你的项目路径下,用mvn clean清除一下 然后我们通过命令mvn package对项目进行打包 ...
hadoop fs -put /data/mapreduce5/order_items1 /mymapreduce5/in IDEA中编写Java代码 1. package mapreduce5; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import .URI; import .URISyntaxException;
[2021-04-21 11:24:12.249]Container exited with a non-zero exit code 143. 2021-04-21 11:24:14,115 INFO mapreduce.Job: Task Id : attempt_1618974769769_0001_m_000002_0, Status : FAILED [2021-04-21 11:24:11.696]Container [pid=4179,containerID=container_1618974769769_0001_01_000004] is...
Perform reduce on KeyedStream in a rolling manner. Aggregate the current element and the last reduced value into a new value. The types of the three values are the same. public <R> SingleOutputStreamOperator<R> fold(R initialValue, FoldFunction<T, R> folder) ...
0 : 1; } public static void main(String[] args) throws Exception { int exitCode = ToolRunner.run(new FileMergeDriver(), args); System.exit(exitCode); } } MyReducer类 package com.sxt.file.test1; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Reducer; import ...