A Resend Request Protocol is a communication mechanism designed to ensure the reliable and ordered delivery of messages within a data stream by allowing a recipient to explicitly ask for retransmission of any detected missing segments. This protocol is essential for maintaining data integrity and session continuity, especially over unreliable network connections. It safeguards against data loss.
Mechanism
The operational flow typically involves a sender transmitting messages with sequential identifiers. The receiver monitors these identifiers, and if a gap in the sequence is detected, indicating a lost message, the receiver transmits a “resend request” message back to the sender, specifying the range of missing sequence numbers. The sender then retransmits the requested messages. This closed-loop control guarantees completeness.
Methodology
The strategic implementation of a resend request protocol is critical in financial messaging systems, such as the FIX protocol used in institutional crypto trading, where the integrity and sequence of market data and order instructions are paramount. It ensures that all trade-critical information is received and processed without omissions or reordering, thus reducing operational risk and supporting deterministic algorithmic trading by maintaining a consistent view of market state.
The FIX Session Layer prevents quote data loss through sequence numbering, heartbeats, and explicit message recovery, ensuring continuous, reliable market information.
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