Planning network knowledge accumulation

1. Causes and solutions of sticky bags

Packet Sticking means that in network communication, the sent data packets are merged into one large data block or multiple data packets are split into smaller data blocks at the receiving end, causing the receiving end to be unable to correctly parse and parse the packets. The phenomenon of processing data.

Sticky bag problems may be caused by the following reasons:

1. Buffer size limit : The buffer size of the receiving end is limited. When the sender sends multiple data packets continuously, the receiving end may not be able to read and process all the data in time, resulting in packet sticking.

2. Data sending speed is too fast : If the sender continuously sends a large number of data packets in a short period of time, and the processing speed of the receiver is slow, it will easily lead to packet sticking problems.

3. Unreasonable protocol design : Some protocols do not clearly specify the boundaries of data packets when transmitting data. For example, TCP is a streaming protocol, and there is no guarantee that each received data corresponds to a complete data packet, which may also lead to packet sticking. question.

In order to solve the sticky bag problem , you can take the following methods:

1. Fixed-length packet : When sending a data packet, the sender fixes the length of each data packet, and the receiver parses it according to the fixed length. This ensures that each packet is parsed and processed correctly, but wastes bandwidth, especially for packets of varying lengths.

2. Delimiter : Use a specific delimiter in the packet to identify the boundaries of each packet, such as a newline character or other custom delimiter character. The receiver cuts and parses the received data according to the delimiter. This method is relatively flexible, but you need to ensure that the delimiter does not conflict with the data content.

3. Header + body : When sending a data packet, a fixed-length header is added to the beginning of the data packet, and the header contains the length information of the data packet. The receiver first reads the packet header, and then reads the data of the corresponding length according to the length information in the packet header and processes it as a data packet.

4. Using message queue : The sender puts the data packet into the message queue according to certain rules, and the receiver reads the data from the message queue for processing. Message queues can provide functions of buffering and adjusting sending and receiving speeds, thereby reducing the occurrence of sticky packet problems.

5. Application layer protocol design : When designing application layer protocols, you can consider adding fields such as message sequence number and message length, as well as clearly defining message boundaries, so as to avoid packet sticking problems at the protocol level.

Taking the above methods into consideration, you can choose a suitable solution to deal with the sticking problem according to the specific situation.