当脚本在运行时报错信息如下：

Examining task ID: task_201201061122_0007_m_000002 (and more) from job job_201201061122_0007

Exception in thread "Thread-23" 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://10.200.187.27:50060/tasklog?taskid=attempt_201201061122_0007_m_000000_2&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) ... 3 more FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.MapRedTask MapReduce Jobs Launched: 

将http://10.200.187.27:50060/tasklog?taskid=attempt_201201061122_0007_m_000000_2&start=-8193这段复制出来，输入到IE浏览器的地址栏内，然后出现这样的信息：

HTTP ERROR 400

Problem accessing /tasklog. Reason:

Argument attemptid is required

---

Powered by Jetty://

这时将attemptid替换浏览器地址栏里的参数taskid，然后就出现以下内容：

Task Logs: 'attempt_201201061122_0006_m_000000_1'

stdout logs

---

stderr logs

Traceback (most recent call last):  File "/bin/is_good_quality.py", line 8, in 
    
         if(temp!="9999" and re.match("[01459]",q)):NameError: name 'q' is not definedorg.apache.hadoop.hive.ql.metadata.HiveException: Hit error while closing ..	at org.apache.hadoop.hive.ql.exec.ScriptOperator.close(ScriptOperator.java:452)	at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:566)	at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:566)	at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:566)	at org.apache.hadoop.hive.ql.exec.ExecMapper.close(ExecMapper.java:193)	at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)	at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:436)	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372)	at org.apache.hadoop.mapred.Child$4.run(Child.java:255)	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:249)org.apache.hadoop.hive.ql.metadata.HiveException: Hit error while closing ..	at org.apache.hadoop.hive.ql.exec.ScriptOperator.close(ScriptOperator.java:452)	at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:566)	at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:566)	at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:566)	at org.apache.hadoop.hive.ql.exec.ExecMapper.close(ExecMapper.java:193)	at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)	at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:436)	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372)	at org.apache.hadoop.mapred.Child$4.run(Child.java:255)	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:249)org.apache.hadoop.hive.ql.metadata.HiveException: Hit error while closing ..	at org.apache.hadoop.hive.ql.exec.ScriptOperator.close(ScriptOperator.java:452)	at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:566)	at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:566)	at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:566)	at org.apache.hadoop.hive.ql.exec.ExecMapper.close(ExecMapper.java:193)	at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)	at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:436)	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372)	at org.apache.hadoop.mapred.Child$4.run(Child.java:255)	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:249)
    

就可以看到具体的错误信息了，以上是基于hadoop-0.20.205.0的版本。