Error during job, obtaining debugging information or java.lang.ClassNotFoundExc

Total MapReduce jobs = 1
Launching Job 1 out of 1
Number of reduce tasks determined at compile time: 1
In order to change the average load for a reducer (in bytes):
  set hive.exec.reducers.bytes.per.reducer=<number>
In order to limit the maximum number of reducers:
  set hive.exec.reducers.max=<number>
In order to set a constant number of reducers:
  set mapred.reduce.tasks=<number>
Starting Job = job_201203251957_0006, Tracking URL = http://master:50030/jobdetails.jsp?jobid=job_201203251957_0006
Kill Command = /usr/local/hadoop-0.20.203.0/bin/../bin/hadoop job  -Dmapred.job.tracker=hdfs://master:9001 -kill job_201203251957_0006
Hadoop job information for Stage-1: number of mappers: 1; number of reducers: 1
2012-03-25 23:13:27,259 Stage-1 map = 0%,  reduce = 0%
2012-03-25 23:14:06,446 Stage-1 map = 100%,  reduce = 100%
Ended Job = job_201203251957_0006 with errors
Error during job, obtaining debugging information...
Examining task ID: task_201203251957_0006_m_000002 (and more) from job job_201203251957_0006
Exception in thread "Thread-143" java.lang.RuntimeException: Error while reading from task log url
        at org.apache.hadoop.hive.ql.exec.errors.TaskLogProcessor.getErrors(TaskLogProcessor.java:130)
        at org.apache.hadoop.hive.ql.exec.JobDebugger.showJobFailDebugInfo(JobDebugger.java:211)
        at org.apache.hadoop.hive.ql.exec.JobDebugger.run(JobDebugger.java:81)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.IOException: Server returned HTTP response code: 400 for URL: http://slave2:50060/tasklog?taskid=attempt_201203251957_0006_m_000000_1&start=-8193
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1436)
        at java.net.URL.openStream(URL.java:1010)
        at org.apache.hadoop.hive.ql.exec.errors.TaskLogProcessor.getErrors(TaskLogProcessor.java:120)


如果在执行hive的查询语句时出现以上错误，并且在http://192.168.200.128:50030/jobtracker.jsp中，查看错误信息，会有以下的错误信息：


java.lang.RuntimeException: Error in configuring object
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:431)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:371)
at org.apache.hadoop.mapred.Child$4.run(Child.java:259)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
at org.apache.hadoop.mapred.Child.main(Child.java:253)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
... 9 more
Caused by: java.lang.RuntimeException: Error in configuring object
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
... 14 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
... 17 more
Caused by: java.lang.RuntimeException: Map operator initialization failed
at org.apache.hadoop.hive.ql.exec.ExecMapper.configure(ExecMapper.java:121)
... 22 more
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.ClassNotFoundException: org.apache.hadoop.hive.contrib.serde2.RegexSerDe
at org.apache.hadoop.hive.ql.exec.MapOperator.setChildren(MapOperator.java:406)
at org.apache.hadoop.hive.ql.exec.ExecMapper.configure(ExecMapper.java:90)
... 22 more
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hive.contrib.serde2.RegexSerDe
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:819)
at org.apache.hadoop.hive.ql.exec.MapOperator.initObjectInspector(MapOperator.java:233)
at org.apache.hadoop.hive.ql.exec.MapOperator.setChildren(MapOperator.java:366)
... 23 more


这是因为要在执行hive语句的时候的加上lib文件中的hive_contrib.jar，因为在建表的时候加入了正则表达式。

执行的语句为：
hive> add jar ../lib/hive_contrib.jar ;