Hadoop WritableComparable
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WritableComparable用途是是为了确定是不是相同的key,因此得出如下结论:
hadoop为Key的数据类型必须实现WritableComparable
如果以bean作为key,实例化了WritableComparable接口,一定要注意
- public int compareTo(T o)
{ - }
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