Merging data downloads with real-time data feeds

1. A non-transitory computer readable medium having stored therein instructions executable by a processor, including instructions executable to:

receive, by a client device from a real-time data feed of a data publisher, a plurality of real-time items of data, each real-time item data of the plurality of real-time items data having a message identifier identifying a position the real-time item of data relative to other real-time items data of the plurality of real-time items data in the real-time data feed;

download, by the client device from a download connection with a data repository, a plurality of downloaded items of data, where each downloaded item of data of the plurality of downloaded items of data includes the message identifier and is received at the data repository from the data publisher;

determine, by the client device according to the message identifier of the downloaded items of data, a most recent downloaded item of data of the plurality downloaded items of data;

determine, by the client device according to the message identifier of the real-time items of data, a most-recent real-time item of data of the plurality of real-time items of data received from the real-time data feed;

compare, by the client device, the most recent downloaded item of data downloaded by the download connection from the data repository with the most-recent real-time item of data received by the real-time data feed of the data publisher to determine a match according to the message identifier of the real-time item of data matching the message identifier of the downloaded item of data; and responsively

end, by the client device, the download connection in response to the determined match between the compared message identifier of the real-time item of data and the message identifier of the downloaded item of data.

2. The non-transitory computer readable medium of claim 1 , further including instructions executable to establish, by the client device, the download connection with a data repository.

3. The non-transitory computer readable medium of claim 1 , where the data repository includes an order repository.

4. The non-transitory computer readable medium of claim 1 , further including instructions executable to establish, by the client device, a connection with the real-time data feed.

5. The non-transitory computer readable medium of claim 4 , where the instructions executable to establish include instructions executable to subscribe to the real-time data feed.

6. The non-transitory computer readable medium of claim 1 , where the data publisher includes an electronic exchange.

7. The non-transitory computer readable medium of claim 6 , where the downloaded item of data and the real-time item of data include market data.

8. The non-transitory computer readable medium of claim 1 , further including instructions executable to receive, at the data repository, the real-time item of data from the real data feed.

9. The non-transitory computer readable medium of claim 1 , where the downloaded item of data includes a previous real-time item of data stored by the order repository.

10. A system for merging downloaded data with a real-time data, the system including:

a client device having instructions stored in a memory and executable by a processor, where the executable instructions configured the client device to:

receive, from a real-time data feed of a data publisher, a plurality of real-time items of data, each real-time item data of the plurality of real-time items data having a message identifier identifying a position the real-time item of data relative to other real-time items data of the plurality of real-time items data in the real-time data feed;

download, from a download connection with a data repository, a plurality of downloaded items of data, where each downloaded item of data of the plurality of downloaded items of data includes the message identifier and is received at the data repository from the data publisher;

determine, according to the message identifier of the downloaded items of data, a most recent downloaded item of data of the plurality downloaded items of data;

determine, according to the message identifier of the real-time items of data, a most-recent real-time item of data of the plurality of real-time items of data received from the real- time data feed;

compare the most recent downloaded item of data downloaded by the download connection from the data repository with the most-recent real-time item of data received by the real-time data feed of the data publisher to determine a match according to the message identifier of the real-time item of data matching the message identifier of the downloaded item of data; and responsively

end the download connection in response to the determined match between the compared message identifier of the real-time item of data and the message identifier of the downloaded item of data.

11. The system of claim 10 , where the client device is configured to establish the download connection with a data repository.

12. The system of claim 10 , where the data repository includes an order repository.

13. The system of claim 10 , where the client device is configured to establish a connection with the real-time data feed.

14. The system of claim 13 , where establishing includes subscribing to the real-time data feed.

15. The system of claim 10 , where the data publisher includes an electronic exchange.

16. The system of claim 15 , where the downloaded item of data and the real-time item of data include market data.

17. The system of claim 10 , where the downloaded item of data includes a previous real-time item of data stored by the order repository.