Methods and apparatus for requesting message gap fill requests and responding to message gap fill requests

摘要

Various embodiments are directed to gap fill methods and apparatus. In an exchange system a device in the exchange may request a message gap fill when it detects that it may be missing one or more messages. The gap fill message may include a range of message identifiers or message counter values identifying the messages which are being requested by the multicast gap fill message. A message logging system included in the exchange may include a plurality of message logging devices. A multicast gap fill message may specify a set of messages to be provided which is very large. Multiple devices may respond to the requesting device with the responding device providing one, multiple or all the messages. Replies to multicast gap fill request messages are sent in the form of unicast messages from directed to the device which sent the multicast gap fill request message.

主权项

1. A method for use in an exchange system, the method comprising:
receiving a first multicast message including a first multicast address as a destination address, said first multicast message further including a message identifier, determining if the message identifier matches an expected message identifier; when it is determined that the received message identifier does not match the expected message identifier transmitting a multicast gap fill request message requesting a message gap fill, said multicast gap fill request message including, as a destination address, a second multicast address corresponding to a first multicast group including a plurality of message logging devices; updating preferred lamina device information based on which lamina device is the quickest to respond to the clap fill request message; and using a response to a clap fill request message to identify a message logging device that was added to the exchange system.