TCP控制位 sendUrgentData 队列 队列元素 优先级 极限 急停 置顶

Socket (Java Platform SE 7 ) https://docs.oracle.com/javase/7/docs/api/java/net/Socket.html#sendUrgentData(int)

sendUrgentData

public void sendUrgentData(int data)
                    throws IOException

Send one byte of urgent data on the socket. The byte to be sent is the lowest eight bits of the data parameter. The urgent byte is sent after any preceding writes to the socket OutputStream and before any future writes to the OutputStream.

Parameters:

data - The byte of data to send

Throws:

IOException - if there is an error sending the data.

Since:

1.4

http://kafka.apache.org/protocol#The_Messages_OffsetCommit