我正在尝试在 Oozie 上运行 MapReduce 作业,但它失败并被杀死。该错误也不会显示在 oozie 控制台中,它只给出以下错误消息:“Map/Reduce failed, error message[]”。我在哪里可以找到日志,它是否包含确切的错误。我是新手,不知道出了什么问题。任何人请告诉我以下代码有什么问题。我现在为此痛苦了两天。
这是我的 MapReduce 程序。
package com.hadoop.mapreduce;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
public class AnalysePatientRecords {
public static class SampleMap extends Mapper<LongWritable, Text, Text, Text> {
public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
String line = value.toString();
String[] lineElements = line.split("\\|",-1);
Text state = new Text(lineElements[11]);
Text patientId = new Text(lineElements[0]);
context.write(state, patientId);
}
}
public static class SampleReduce extends Reducer<Text, Text, Text, IntWritable> {
@SuppressWarnings("unused")
public void reduce(Text value, Iterable<Text> values, Context context)
throws IOException, InterruptedException {
int count = 0;
for (Text val : values) {
count = count + 1;
}
context.write(value, new IntWritable(count));
}
}
public static void main(String[] args) throws Exception {
Configuration conf = new Configuration();
Job job = Job.getInstance(conf, "patient analysis");
job.setJarByClass(AnalysePatientRecords.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);
job.setMapperClass(SampleMap.class);
job.setReducerClass(SampleReduce.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}
工作属性
nameNode=hdfs://localhost:54310
jobTracker=localhost:8032
queueName=default
examplesRoot=MapReduce
oozie.libpath=${nameNode}/user/${user.name}/share/lib
oozie.use.system.libpath=true
oozie.wf.application.path=${nameNode}/user/${user.name}/${examplesRoot}/apps/map-reduce/workflow.xml
outputDir=map-reduce
工作流.xml
<workflow-app xmlns="uri:oozie:workflow:0.2" name="map-reduce-wf">
<start to="mr-node"/>
<action name="mr-node">
<map-reduce>
<job-tracker>${jobTracker}</job-tracker>
<name-node>${nameNode}</name-node>
<prepare>
<delete path="${nameNode}/user/${wf:user()}/${examplesRoot}/output-data/${outputDir}"/>
</prepare>
<configuration>
<property>
<name>mapred.mapper.new-api</name>
<value>true</value>
</property>
<property>
<name>mapred.reducer.new-api</name>
<value>true</value>
</property>
<property>
<name>mapred.job.queue.name</name>
<value>${queueName}</value>
</property>
<property>
<name>mapreduce.map.class</name>
<value>AnalysePatientRecords$SampleMap</value>
</property>
<property>
<name>mapreduce.reduce.class</name>
<value>AnalysePatientRecords$SampleReduce</value>
</property>
<property>
<name>mapred.mapoutput.key.class</name>
<value>org.apache.hadoop.io.Text</value>
</property>
<property>
<name>mapred.mapoutput.value.class</name>
<value>org.apache.hadoop.io.Text</value>
</property>
<property>
<name>mapred.output.key.class</name>
<value>org.apache.hadoop.io.Text</value>
</property>
<property>
<name>mapred.output.value.class</name>
<value>org.apache.hadoop.io.IntWritable</value>
</property>
<property>
<name>mapred.map.tasks</name>
<value>1</value>
</property>
<property>
<name>mapred.input.dir</name>
<value>/user/${wf:user()}/${examplesRoot}/input-data/text</value>
</property>
<property>
<name>mapred.output.dir</name>
<value>/user/${wf:user()}/${examplesRoot}/output-data/${outputDir}</value>
</property>
</configuration>
</map-reduce>
<ok to="end"/>
<error to="fail"/>
</action>
<kill name="fail">
<message>Map/Reduce failed, error message[${wf:errorMessage(wf:lastErrorNode())}]</message>
</kill>
<end name="end"/>
</workflow-app>
我还创建了上述 MapReduce 程序的 jar,并将其放在 lib 文件夹中。我不知道有什么问题请帮我解决这个问题。请...