If you use the data source mode as the SDP server's time control method, the times set in the tuples need to be in ascending order of the input streams. If tuples are sent from multiple input adaptors, an error might occur between tuple times and arrival times, and a tuple that has arrived so that its time is out of sequence might be discarded by the SDP server. For example, if tuples arrive at the SDP server in the order 09:00:04, 09:00:05, and 09:00:02, the tuple with the time 09:00:02 would be discarded.
In such a case, you can use the timestamp adjustment function to set a tuple arrival time adjustment value, so that the SDP server can receive those tuples notwithstanding that the times are not in chronological order. In the above example, if the tuple arrival time adjustment value is set to 5, the tuple with timestamp 09:00:02 will not be discarded even though it arrived after 09:00:05.
For details about the mechanism of the timestamp adjustment function and how to set up the function, see 10.8 Timestamp adjustment for tuples.