学步园

问题：

向桶表中插入数据出现异常，错误日志如下：

Exception in thread "Thread-25" java.lang.RuntimeException: Error while reading from task log url
	at org.apache.hadoop.hive.ql.exec.errors.TaskLogProcessor.getStackTraces(TaskLogProcessor.java:240)
	at org.apache.hadoop.hive.ql.exec.JobDebugger.showJobFailDebugInfo(JobDebugger.java:227)
	at org.apache.hadoop.hive.ql.exec.JobDebugger.run(JobDebugger.java:92)
	at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.IOException: Server returned HTTP response code: 400 for URL: http://liaozhongmin:50060/tasklog?taskid=attempt_201501231449_0050_m_000000_0&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.getStackTraces(TaskLogProcessor.java:192)
	... 3 more
FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.MapRedTask
MapReduce Jobs Launched: 
Job 0: Map: 1  Reduce: 4   HDFS Read: 0 HDFS Write: 0 FAIL

关键看Caused by：

http://liaozhongmin:50060/tasklog?taskid=attempt_201501231449_0050_m_000000_0&start=-8193

我们可以通过这个URL快速定位到具体错误，方法是将taskid改为appemptid，如下：

http://liaozhongmin:50060/tasklog?attemptid=attempt_201501231449_0050_m_000000_0&start=-8193

然后再把修改后的URL贴到浏览器中，比如我这里：

然后再根据具体的错误去解决问题！