hadoop-错误总结

hadoop-错误总结

  本来hadoop实验已经做完，打算把最后一个实验报告写完，就去自习室学习的。没想到啊，没想到~恢复虚拟机的时候slave起不来了~~slave关机重启后，master的hive操作发生了错误！并且已经将所有的服务启动，master的hadoop也关了，重新启动~没用~，最后发现，是两个实例时间不同步，以前都是虚拟机暂停的，所以服务可以使用~。

• mapreduce erros

  • hive返回的信息

    Number of reduce tasks is set to 0 since there's no reduce operator
    Starting Job = job_1494973524176_0069, Tracking URL = http://master:18088/proxy/application_1494973524176_0069/
    Kill Command = /home/liu/hadoop-2.5.2/bin/hadoop job  -kill job_1494973524176_0069
    Hadoop job information for Stage-1: number of mappers: 0; number of reducers: 0
    2017-06-13 20:50:54,767 Stage-1 map = 0%,  reduce = 0%
    Ended Job = job_1494973524176_0069 with errors
    Error during job, obtaining debugging information...
    FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.mr.MapRedTask
    MapReduce Jobs Launched: 
    Job 0:  HDFS Read: 0 HDFS Write: 0 FAIL
    Total MapReduce CPU Time Spent: 0 msec

  • 网页查看错误http://master:18088/cluster/app/application_1494973524176_0072

    This token is expired. current time is 1497442339283 found 1497414139585
    at sun.reflect.GeneratedConstructorAccessor44.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526) 

    

• 同步时间
  su root
htpdate -u ntp.api.bz (ntp 上海服务器)


• hive重新启动任务
  

• 参考

  • 时间同步