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How to specify the mappers failure threshold for a hadoop mapreduce job?

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I was set property mapreduce.map.failures.maxpercent = 10 for my job. My job was marked as FAILED after 159 mappers out of 162 (98%) total was successfully completed. What am i doing wrong?

I use Hadoop MR 2.6.0-cdh5.4.1 (75a690c8acab4f8da102c9d2e6b6405f25090302).

hadoop mapreduce cloudera hadoop2 cloudera-cdh
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