Hadoop报错信息：Job not successful. Error: # of failed Map Tasks exceeded allowed limit. FailedCount: 4.
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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_000002121 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。
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