Glad you figured out your bug. It's worth pointing out that Google's
MapReduce has stricter type signatures than Hadoop does. Hadoop allows the
final (k, v) pairs to be of a different type than the inputs to the reducer,
and the final key associated with a final value does not necessarily need to
b
Hi, all
I solved it!
By through set:
conf.setMapOutputKeyClass(Text.class);
conf.setMapOutputValueClass(BytesWritable.class);
conf.setOutputKeyClass(Text.class);
conf.setOutputValueClass(Text.class);
So stupid I am! I need to read more documents first!
Best Regar
Hi, all
>From the original paper of mapReduce by google, the signature of data
transform is that:
map: (k1, v1) -> list(k2, v2)
reduce: (k2, list(v2)) -> list(v2)
Here, the output value type is v2, and the final type is also v2.
But, what I want to achieve is that, the final value type should
