Mapreduce

When I was doing MR, I wanted to write the results into a new set. In fact, I have done it before, but in my impression, it always seems that I can’t write it in.

//....more code
 try {
 cmd = new MapReduceCommand(
 this.dbc, MapString,
 ReduceString,
 dbtemp,
 MapReduceCommand.OutputType.REPLACE,
 query);
 
 cmd.setFinalize(Finalize);
 output = this.dbc.mapReduce(cmd);
 }
 //...more code

The formal parameters of MapReduceCommand are as follows

public MapReduceCommand(com.mongodb.DBCollection inputCollection, java.lang.String map, java.lang.String reduce, java.lang.String outputCollection,   com.mongodb.MapReduceCommand.OutputType type, com.mongodb.DBObject query) { /* compiled code */ }

I hope some of mongo’s friends will discuss it together.