我有一个我自己创建的jar文件“Tsp.jar”。这个相同的jar文件在hadoop的单节点集群设置中执行得很好。但是,当我在包含2台机器,笔记本电脑和台式机的集群上运行它时,它会在地图功能达到50%时给我一个例外。这里是输出hadoop没有在多节点集群中运行
`[email protected]:/usr/local/hadoop$ bin/hadoop jar Tsp.jar clust-Tsp_ip1 clust_Tsp_op4
11/04/27 16:13:06 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.
11/04/27 16:13:06 WARN mapred.JobClient: No job jar file set. User classes may not be found. See JobConf(Class) or JobConf#setJar(String).
11/04/27 16:13:06 INFO mapred.FileInputFormat: Total input paths to process : 1
11/04/27 16:13:06 INFO mapred.JobClient: Running job: job_201104271608_0001
11/04/27 16:13:07 INFO mapred.JobClient: map 0% reduce 0%
11/04/27 16:13:17 INFO mapred.JobClient: map 50% reduce 0%
11/04/27 16:13:20 INFO mapred.JobClient: Task Id : attempt_201104271608_0001_m_000001_0, Status : FAILED
java.lang.RuntimeException: java.lang.RuntimeException: java.lang.ClassNotFoundException: Tsp$TspReducer
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:841)
at org.apache.hadoop.mapred.JobConf.getCombinerClass(JobConf.java:853)
at org.apache.hadoop.mapred.Task$CombinerRunner.create(Task.java:1100)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:812)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:350)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
at org.apache.hadoop.mapred.Child.main(Child.java:170)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: Tsp$TspReducer
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:809)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:833)
... 6 more
Caused by: java.lang.ClassNotFoundException: Tsp$TspReducer
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:762)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:807)
... 7 more
11/04/27 16:13:20 WARN mapred.JobClient: Error reading task outputemil-desktop
11/04/27 16:13:20 WARN mapred.JobClient: Error reading task outputemil-desktop
^Z
[1]+ Stopped bin/hadoop jar Tsp.jar clust-Tsp_ip1 clust_Tsp_op4
[email protected]:~$ jps
4937 Jps
3976 RunJar
` ALSE群集工作得很好执行单词计数的例子。所以我猜测它与Tsp.jar文件的问题。
1)是否需要在集群上运行jar文件?
2)在这里,我尝试在我创建的集群中运行一个jar文件。但仍然发出jar文件未找到的警告。这是为什么?
3)运行jar文件时应该注意什么?就像我写的程序除了它所包含的内容一样吗?我的jar文件包含一个Tsp.class,Tsp $ TspReducer.class和一个Tsp $ TspMapper.class。该终端说,它不能找到Tsp $ TspReducer时,它已经在jar文件中。
三江源
编辑
public class Tsp {
public static void main(String[] args) throws IOException {
JobConf conf = new JobConf(Tsp.class);
conf.setJobName("Tsp");
conf.setOutputKeyClass(Text.class);
conf.setOutputValueClass(Text.class);
conf.setMapperClass(TspMapper.class);
conf.setCombinerClass(TspReducer.class);
conf.setReducerClass(TspReducer.class);
FileInputFormat.addInputPath(conf,new Path(args[0]));
FileOutputFormat.setOutputPath(conf,new Path(args[1]));
JobClient.runJob(conf);
}
public static class TspMapper extends MapReduceBase
implements Mapper<LongWritable, Text, Text, Text> {
function findCost() {
}
public void map(LongWritable key,Text value, OutputCollector<Text, Text> output, Reporter reporter) throws IOException {
find adjacency matrix from the input;
for(int i = 0; ...) {
.....
output.collect(new Text(string1), new Text(string2));
}
}
}
public static class TspReducer extends MapReduceBase implements Reducer<Text, Text, Text, Text> {
Text t1 = new Text();
public void reduce(Text key, Iterator<Text> values, OutputCollector<Text, Text> output, Reporter reporter) throws IOException {
String a;
a = values.next().toString();
output.collect(key,new Text(a));
}
}
}
您是否定义过减少静态类? – khmarbaise 2011-04-27 12:06:27
您可以发布简化的代码吗?我们可能需要查看映射器和缩减器的扩展方式以及覆盖的定义。以及您的作业设置代码。 – Nija 2011-04-27 13:59:01
@khmarbaise:是的,我做到了。 – emiljho 2011-04-28 17:00:07