Unable to initialize MapOutputCollector org.apache.hadoop.mapred.MapTask$MapOutputBuffer java.lang.C
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我是对map的输出key类型仅仅实现了Writable，而没有实现comparable
由上图可知，会进行shuffle阶段对key进行分类，相同的key，会把value收集在一起，就是reduce 的Iterable value
解决办法 需要map阶段输出的key类型实现 compareTo
如果只进行序列化是可以仅仅实现Writable接口 write（），readFile的
map到reduce时存在shuffle,若作为key，则需要实现WritableComparable
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