How could the storm bolt receive multiple type tuple from different spout or other bolt?

Question

我有两个可序列化的类A和B。并且有两种喷头A_spout和B_spout。每个喷头都发出并行类以栓接C。但是在执行方法方面，元组没有什么区别，那么如何区分它们呢？

Answer 1

Each input Tuple in Bolt.execute() carries some meta data which also contains the input operator it originates from:

public void execute(Tuple input) {
    if(input.getSourceComponent().equals("A_Spout")) {
        // do something
    } else {
        // data from B_Spout; do something different
    }
}