Hadoop的小作業模式， 數據量小非常節約時間，測試使用Uber，數據量超過塊大小就會自動啟用了。
要啟動ubertask，reduce數得是1。
參數設置：
mapreduce.job.ubertask.enable
mapreduce.job.ubertask.maxbytes //塊大小
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