Reliable Event Logging Protocol (RELP), a networking protocol for computer data logging in computer networks, extends the functionality of the syslog protocol to provide reliable delivery of event messages. It is most often used in environments which do not tolerate message loss, such as the financial industry.
Overview
RELP uses TCP for message transmission. This provides basic protection against message loss, but does not guarantee delivery under all circumstances. When a connection aborts, TCP cannot reliably detect whether the last messages sent have actually reached their destination.[1] Unlike the syslog protocol, RELP works with a backchannel which conveys information back to the sender about messages processed by the receiver. This enables RELP to always know which messages have been properly received, even in the case of a connection abort.
History
RELP was developed in 2008 as a reliable protocol for rsyslog-to-rsyslog communication. As RELP designer Rainer Gerhards explains, the lack of reliable transmission in industry-standard syslog was a core motivation to create RELP.[2] Originally, RFC 3195 syslog was considered to take up this part in rsyslog, but it suffered from high overhead and missing support for new IETF syslog standards (which have since been published as RFC 5424, but were not named at that time).
While RELP was initially meant solely for rsyslog use, it became adopted more widely.[citation needed] Currently tools both under Linux and Windows support RELP. There are also in-house deployments for Java. While RELP is still not formally standardized, it has evolved into an industry standard for computer logging.[citation needed]
references:
https://en.wikipedia.org/wiki/Reliable_Event_Logging_Protocol
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