我正在学习蜂巢。我已经设置了一个名为records
. 架构如下:
year : string
temperature : int
quality : int
这是示例行
1999 28 3
2000 28 3
2001 30 2
现在,我完全按照 Hadoop The Definitive Guide 一书中的说明在 python 中编写了一个示例 map reduce 脚本:
import re
import sys
for line in sys.stdin:
(year,tmp,q) = line.strip().split()
if (tmp != '9999' and re.match("[01459]",q)):
print "%s\t%s" % (year,tmp)
我使用以下命令运行它:
ADD FILE /usr/local/hadoop/programs/sample_mapreduce.py;
SELECT TRANSFORM(year, temperature, quality)
USING 'sample_mapreduce.py'
AS year,temperature;
执行失败。在终端上我得到这个:
Hadoop job information for Stage-1: number of mappers: 1; number of reducers: 0
2012-08-23 18:30:28,506 Stage-1 map = 0%, reduce = 0%
2012-08-23 18:30:59,647 Stage-1 map = 100%, reduce = 100%
Ended Job = job_201208231754_0005 with errors
Error during job, obtaining debugging information...
Examining task ID: task_201208231754_0005_m_000002 (and more) from job job_201208231754_0005
Exception in thread "Thread-103" 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://master:50060/tasklog?taskid=attempt_201208231754_0005_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
我转到失败的作业列表,这是堆栈跟踪
java.lang.RuntimeException: Hive Runtime Error while closing operators
at org.apache.hadoop.hive.ql.exec.ExecMapper.close(ExecMapper.java:226)
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 java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: 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)
... 8 more
相同的轨迹重复了 3 次以上。
请问,有人可以帮我解决这个问题吗?这里有什么问题?我完全按照书本行事。似乎是什么问题。似乎有两个错误。在终端上,它说它无法从任务日志 url 中读取。在失败的作业列表中,异常说明了一些不同的内容。请帮忙