本文主要是介绍BytesWritable 的copyBytes和getBytes的区别，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
BytesWritable value = new BytesWritable()；
BytesWritable不能作为mapreduce中的key或者value，与ByteWritable不同。1，BytesWritable.tobyte()//将ByteWritable类型的数据转换为十六进制对，并以空格分开；2，BytesWritable.set(byte[] newData,int offset,int length);//将值设置为给定的字节范围的副本3，BytesWritable.copyBytes()//获得对象的byte[]类型全部数据：Get a copy of the bytes that is exactly the length of the data. See getBytes() for faster access to the underlying array.4，BytesWritable.getBytes()//**Get the data backing the BytesWritable. Please use copyBytes() if you need the returned array to be precisely the length of the data.**
| Modifier and Type | Method and Description |
|---|---|
| byte[] | copyBytes()：Get a copy of the bytes that is exactly the length of the data. |
| boolean | equals(Object right_o |
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