publicclassKVTextDriver{publicstatic void main(String[] args) throwsIOException,ClassNotFoundException,InterruptedException{Configurationconf = newConfiguration();//设置切割符 conf.set(KeyValueLineRecordReader.KEY_VALUE_SEPERATOR," ");//1获取job对象Jobjob =Job.getInstance(conf);//2设置jar包位置,关联ma...
importorg.apache.hadoop.mapreduce.lib.input.KeyValueLineRecordReader; importorg.apache.hadoop.mapreduce.lib.input.KeyValueTextInputFormat; importorg.apache.hadoop.mapreduce.lib.output.FileOutputFormat; /** * hello you hello you * hello me * */ publicclassMyKeyValueTextInputFormatApp{ privatestatic...
job.setInputFormatClass(KeyValueTextInputFormat.class); 重点是红色部分代码,配置这两个地方就可以,这是hadoop1.0的配置方法 但是很多书上写的都是 jobConf.set("key.value.separator.in.input.line", ","); job.setOutputFormatClass(TextOutputFormat.class); 很多书上都是这么写的,因为这是旧的api,网上也...
Hadoop 1.x之后,Job和Configuration之间的职责有了更清晰的划分。以上语句可工作的原因是,当设置job的InputFormatClass值为KeyValueTextInputFormatj时,从源码可看到 1publicRecordReader<Text, Text>createRecordReader(InputSplit genericSplit,2TaskAttemptContext context)throwsIOException {3context.setStatus(genericSplit....
String inputFormatClassName = inputFormatClass.getName(); if (inputFormatClassName.equals("org.apache.hadoop.mapred.TextInputFormat")) { ((TextInputFormat)inputFormat).configure(conf); } else if (inputFormatClassName.equals("org.apache.hadoop.mapred.KeyValueTextInputFormat")) { ((KeyValueText...
百度试题 题目hadoop架构中的主要用InputFormats进行数据切分,哪一个是默认值() A. TextInputFormat B. KeyValueInputFormat C. SequenceFileInputFormat D. FileInputFormat 相关知识点: 试题来源: 解析 A.TextInputFormat 反馈 收藏
set("key.value.separator.in.input.line", ",");确保比在Map上有一个类似的东西看Mapper<Text,...
>> I am trying to run a small MapReduce job that includes >> KeyValueTextInputFormat with the new API(hadoop-0.20.205.0), but it >> seems KeyValueTextInputFormat is not included in the new API. Am I >> correct??? >> >> Regards, >> Mohammad Tariq...
B.HADOOP_MAP_DATATYPES环境变量C.随作业一起提交的mapper-specification.xml文件D.InputFormat格式类 免费查看参考答案及解析 题目: [多选题] 分布式缓存服务中天翼云打造的分布式Key-Value数据库服务,兼容Redis协议,主要用于持久化数据的存储或缓存数据的存储。DCS提供单机和主备两种缓存实例类型,支持( ) A、 自动...
开发者ID:apache,项目名称:incubator-tez,代码行数:36,代码来源:IntersectExample.java 示例3: run ▲点赞 2▼ importorg.apache.tez.runtime.library.api.KeyValueReader;//导入方法依赖的package包/类@Overridepublicvoidrun()throwsException{ Preconditions.checkState(getInputs().size() ==2); ...