error in shuffle in fetcher#5,Exceeded MAX_FAILED_UNIQUE_FETCHES; bailing-out

Error: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle in fetcher#5 Caused by: java.io.IOException: Exceeded MAX_FAILED_UNIQUE_FETCHES; bailing-out 图为错误信息,运行的是example中提供
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