0

我已经在我的两节点集群设置上运行了几次 Hadoop 作业（字数统计示例），到目前为止它运行良好。我不断收到一个 RuntimeException ，它使 reduce 过程停止在 19%：

    2013-04-13 18:45:22,191 INFO org.apache.hadoop.mapred.Task: Task:attempt_201304131843_0001_m_000000_0 is done. And is in the process of commiting
    2013-04-13 18:45:22,299 INFO org.apache.hadoop.mapred.Task: Task 'attempt_201304131843_0001_m_000000_0' done.
    2013-04-13 18:45:22,318 INFO org.apache.hadoop.mapred.TaskLogsTruncater: Initializing logs' truncater with mapRetainSize=-1 and reduceRetainSize=-1
    2013-04-13 18:45:23,181 WARN org.apache.hadoop.mapred.Child: Error running child
    java.lang.RuntimeException: Error while running command to get file permissions : org.apache.hadoop.util.Shell$ExitCodeException: 
    at org.apache.hadoop.util.Shell.runCommand(Shell.java:255)
at org.apache.hadoop.util.Shell.run(Shell.java:182)
at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:375)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:461)
at org.apache.hadoop.util.Shell.execCommand(Shell.java:444)
at org.apache.hadoop.fs.FileUtil.execCommand(FileUtil.java:710)
at org.apache.hadoop.fs.RawLocalFileSystem$RawLocalFileStatus.loadPermissionInfo(RawLocalFileSystem.java:443)
at org.apache.hadoop.fs.RawLocalFileSystem$RawLocalFileStatus.getOwner(RawLocalFileSystem.java:426)
at org.apache.hadoop.mapred.TaskLog.obtainLogDirOwner(TaskLog.java:267)
at org.apache.hadoop.mapred.TaskLogsTruncater.truncateLogs(TaskLogsTruncater.java:124)
at org.apache.hadoop.mapred.Child$4.run(Child.java:260)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
at org.apache.hadoop.mapred.Child.main(Child.java:249)

    at org.apache.hadoop.fs.RawLocalFileSystem$RawLocalFileStatus.loadPermissionInfo(RawLocalFileSystem.java:468)
at org.apache.hadoop.fs.RawLocalFileSystem$RawLocalFileStatus.getOwner(RawLocalFileSystem.java:426)
at org.apache.hadoop.mapred.TaskLog.obtainLogDirOwner(TaskLog.java:267)
at org.apache.hadoop.mapred.TaskLogsTruncater.truncateLogs(TaskLogsTruncater.java:124)
at org.apache.hadoop.mapred.Child$4.run(Child.java:260)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
at org.apache.hadoop.mapred.Child.main(Child.java:249)

有没有人知道可能导致这种情况的原因？

编辑：自己解决了。 如果其他人遇到同样的问题，这是由主节点上的 etc/hosts 文件引起的。我没有输入从节点的主机名和地址。这就是我的主机文件在主节点上的结构：

    127.0.0.1   MyUbuntuServer
    192.xxx.x.xx2   master
    192.xxx.x.xx3   MySecondUbuntuServer
    192.xxx.x.xx3   slave
4

1 回答 1

0

这里描述了一个类似的问题：http: //comments.gmane.org/gmane.comp.apache.mahout.user/8898

那里的信息可能与其他版本的hadoop有关。它说：

java.lang.RuntimeException：运行获取文件权限的命令时出错：java.io.IOException：无法运行程序“/bin/ls”：错误=12，空间不足

他们的解决方案是通过mapred.child.java.opts* *-Xmx1200M更改堆大小

另请参阅：https ://groups.google.com/a/cloudera.org/forum/?fromgroups=#!topic/cdh-user/BHGYJDNKMGE

HTH，阿夫纳

于 2013-05-13T07:58:27.527 回答