Hadoop报错信息：Job not successful. Error: # of failed Map Tasks exceeded allowed limit. FailedCount: 4.

Hadoop报错信息如下：

120 15/01/27 15:48:23 ERROR streaming.StreamJob: Job not successful. Error: # of failed Map Tasks exceeded allowed limit. FailedCount: 4. LastFailedTask: task_20150115

    0420_80244_m_000002
121 15/01/27 15:48:23 INFO streaming.StreamJob: killJob...

122 Streaming Command Failed!

指的是Hadoop在执行的就是出错次数超过了允许次数（allowed limit），失败次数为4。

应该是脚本文件的错误，所以可以把数据getmerge下来，本地跑一下，看看脚本问题出在哪里。