简单的Hadoop Map Reduce出错

时间:2013-06-13 15:23:32

标签: ubuntu hadoop mapreduce word-count

我尝试运行hadoop map减少字数问题。据我所知,我正确设置了HDFS和一切。

当我执行它时,

我在尝试运行简单的字数问题时遇到此错误。我是Hadoop的新手。任何帮助如何解决这个问题将不胜感激。

13/06/13 20:21:17 INFO input.FileInputFormat: Total input paths to process : 4
13/06/13 20:21:17 INFO util.NativeCodeLoader: Loaded the native-hadoop library
13/06/13 20:21:17 WARN snappy.LoadSnappy: Snappy native library not loaded
13/06/13 20:21:17 INFO mapred.JobClient: Running job: job_201306131940_0007
13/06/13 20:21:18 INFO mapred.JobClient:  map 0% reduce 0%
13/06/13 20:21:21 INFO mapred.JobClient: Task Id : attempt_201306131940_0007_m_000005_0, Status : FAILED
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Creation of symlink from /home/vraju/Desktop/hadoop/libexec/../logs/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000005_0 to /app/hadoop/tmp/mapred/local/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000005_0 failed.
at org.apache.hadoop.mapred.TaskLog.createTaskAttemptLogDir(TaskLog.java:110)
at org.apache.hadoop.mapred.DefaultTaskController.createLogDir(DefaultTaskController.java:71)
at org.apache.hadoop.mapred.TaskRunner.prepareLogFiles(TaskRunner.java:316)
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:228)

13/06/13 20:21:21 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000005_0&filter=stdout
13/06/13 20:21:21 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000005_0&filter=stderr
13/06/13 20:21:24 INFO mapred.JobClient: Task Id : attempt_201306131940_0007_m_000005_1, Status : FAILED
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Creation of symlink from /home/vraju/Desktop/hadoop/libexec/../logs/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000005_1 to /app/hadoop/tmp/mapred/local/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000005_1 failed.
at org.apache.hadoop.mapred.TaskLog.createTaskAttemptLogDir(TaskLog.java:110)
at org.apache.hadoop.mapred.DefaultTaskController.createLogDir(DefaultTaskController.java:71)
at org.apache.hadoop.mapred.TaskRunner.prepareLogFiles(TaskRunner.java:316)
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:228)

13/06/13 20:21:25 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000005_1&filter=stdout
13/06/13 20:21:25 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000005_1&filter=stderr
13/06/13 20:21:28 INFO mapred.JobClient: Task Id : attempt_201306131940_0007_m_000005_2, Status : FAILED
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Creation of symlink from /home/vraju/Desktop/hadoop/libexec/../logs/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000005_2 to /app/hadoop/tmp/mapred/local/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000005_2 failed.
at org.apache.hadoop.mapred.TaskLog.createTaskAttemptLogDir(TaskLog.java:110)
at org.apache.hadoop.mapred.DefaultTaskController.createLogDir(DefaultTaskController.java:71)
at org.apache.hadoop.mapred.TaskRunner.prepareLogFiles(TaskRunner.java:316)
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:228)

13/06/13 20:21:28 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000005_2&filter=stdout
13/06/13 20:21:28 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000005_2&filter=stderr
13/06/13 20:21:34 INFO mapred.JobClient: Task Id : attempt_201306131940_0007_m_000004_0, Status : FAILED
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Creation of symlink from /home/vraju/Desktop/hadoop/libexec/../logs/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000004_0 to /app/hadoop/tmp/mapred/local/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000004_0 failed.
at org.apache.hadoop.mapred.TaskLog.createTaskAttemptLogDir(TaskLog.java:110)
at org.apache.hadoop.mapred.DefaultTaskController.createLogDir(DefaultTaskController.java:71)
at org.apache.hadoop.mapred.TaskRunner.prepareLogFiles(TaskRunner.java:316)
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:228)

13/06/13 20:21:34 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000004_0&filter=stdout
13/06/13 20:21:34 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000004_0&filter=stderr
13/06/13 20:21:37 INFO mapred.JobClient: Task Id : attempt_201306131940_0007_m_000004_1, Status : FAILED
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Creation of symlink from /home/vraju/Desktop/hadoop/libexec/../logs/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000004_1 to /app/hadoop/tmp/mapred/local/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000004_1 failed.
at org.apache.hadoop.mapred.TaskLog.createTaskAttemptLogDir(TaskLog.java:110)
at org.apache.hadoop.mapred.DefaultTaskController.createLogDir(DefaultTaskController.java:71)
at org.apache.hadoop.mapred.TaskRunner.prepareLogFiles(TaskRunner.java:316)
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:228)

13/06/13 20:21:37 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000004_1&filter=stdout
13/06/13 20:21:37 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000004_1&filter=stderr
13/06/13 20:21:40 INFO mapred.JobClient: Task Id : attempt_201306131940_0007_m_000004_2, Status : FAILED
java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Creation of symlink from /home/vraju/Desktop/hadoop/libexec/../logs/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000004_2 to /app/hadoop/tmp/mapred/local/userlogs/job_201306131940_0007/attempt_201306131940_0007_m_000004_2 failed.
at org.apache.hadoop.mapred.TaskLog.createTaskAttemptLogDir(TaskLog.java:110)
at org.apache.hadoop.mapred.DefaultTaskController.createLogDir(DefaultTaskController.java:71)
at org.apache.hadoop.mapred.TaskRunner.prepareLogFiles(TaskRunner.java:316)
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:228)
13/06/13 20:21:40 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000004_2&filter=stdout
13/06/13 20:21:40 WARN mapred.JobClient: Error reading task outputhttp://ubuntu:50060/tasklog?plaintext=true&attemptid=attempt_201306131940_0007_m_000004_2&filter=stderr
13/06/13 20:21:43 INFO mapred.JobClient: Job complete: job_201306131940_0007
13/06/13 20:21:43 INFO mapred.JobClient: Counters: 4
13/06/13 20:21:43 INFO mapred.JobClient:   Job Counters 
13/06/13 20:21:43 INFO mapred.JobClient:     SLOTS_MILLIS_MAPS=24100
13/06/13 20:21:43 INFO mapred.JobClient:     Total time spent by all reduces waiting after reserving slots (ms)=0
13/06/13 20:21:43 INFO mapred.JobClient:     Total time spent by all maps waiting after reserving slots (ms)=0
13/06/13 20:21:43 INFO mapred.JobClient:     SLOTS_MILLIS_REDUCES=0

4 个答案:

答案 0 :(得分:5)

当你到了

java.lang.Throwable: Child Error
at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)

似乎为任务跟踪器分配的内存多于节点的实际内存。

您可以获得更多here

答案 1 :(得分:2)

我在尝试做同样的事情时得到了同样的错误 - 在简单文本上执行字数统计。 就我而言,我解决了改变Hadoop所依赖的JDK版本的问题。我正在使用Hadoop 1.2.1,我在网上发现它的首选Java版本是1.6

答案 2 :(得分:0)

我有同样的问题,我整天都在解决,直到我在网上找到一个解决方案,在VirtualBox的共享目录中不支持创建符号链接的操作。如果它解决了将hadoop目录移动到/ usr / local的问题,请尝试。

答案 3 :(得分:0)

我遇到了这个问题,但这是一个包名称问题。

我正在使用maven编译。在pom.xml中,我们有<groupId>GROUPNAME</groupId>

我的所有包都必须在GROUPNAME中,例如GROUPNAME.newpackage.ClassName

然后,它有效。