Anycast transport protocol for content distribution networks
A cache server for providing content includes a processor configured to receive a first datagram from a client system sent to an anycast address, send a response datagram to the client system in response to the first datagram, receive a request datagram from the client system sent to the anycast address, and send a batch of content datagrams to the client system. The first datagram includes a universal resource locator corresponding to the content. The response datagram includes a content identifier for the content. The request datagram includes the content identifier, an offset, and a bandwidth indicator. The batch of content datagrams includes a portion of the content starting at the offset.
1. A system, comprising:
a memory that stores instructions;
a processor that executes the instructions to perform operations, the operations comprising:
receiving, from a client system, a first request datagram sent to an anycast internet protocol address, wherein the first request datagram includes a bandwidth indicator that is provided based on occurrence of a timeout; and
transmitting, to the client system and in response to the first request datagram, a first content datagram including a portion of content.
2. The system of claim 1 , wherein the operations further comprise transmitting, in response to a second request datagram sent to the anycast internet protocol address, a second content datagram including another portion of the content.
3. The system of claim 2 , wherein the operations further comprise receiving, from the client system, the second request datagram sent to the anycast internet protocol address.
4. The system of claim 3 , wherein the bandwidth indicator is based on a recent bandwidth for the another portion of the content.
5. The system of claim 1 , wherein the operations further comprise determining if the content is complete.
6. The system of claim 1 , wherein the operations further comprise determining if the timeout has occurred while waiting for the portion of content.
7. The system of claim 6 , wherein the operations further comprise calculating a recent bandwidth for another portion of the content that has been received by the client system.
8. The system of claim 1 , wherein the operations further comprise resetting the bandwidth indicator to a base rate if the timeout occurred based on a packet buffer overflow.
9. The system of claim 1 , wherein the operations further comprise increasing the bandwidth indicator by an amount if all content datagrams of a batch are received correctly.
10. The system of claim 1 , wherein the first request datagram includes a content identifier and an offset.
11. The system of claim 1 , wherein the operations further comprise transmitting a content identifier to the client system.
12. The system of claim 1 , wherein the operations further comprise receiving the first request datagram via a connectionless protocol.
13. The system of claim 1 , wherein the operations further comprise receiving an updated bandwidth indicator.
14. A method, comprising:
receiving, from a client system, a first request datagram sent to an anycast internet protocol address, wherein the first request datagram includes a bandwidth indicator that is provided based on occurrence of a timeout, wherein the first request datagram is received by utilizing instructions from a memory that are executed by a processor; and
transmitting, to the client system and in response to the first request datagram, a first content datagram including a portion of content.
15. The method of claim 14 , further comprising transmitting a batch of content datagrams to the client system.
16. The method of claim 14 , further comprising resetting the bandwidth indicator to a base rate if the timeout occurred based on a packet buffer overflow.
17. The method of claim 14 , further comprising transmitting, in response to a second request datagram sent to the anycast internet protocol address, a second content datagram including another portion of the content.
18. The method of claim 14 , further comprising transmitting a content identifier to the client system.
19. The method of claim 14 , further comprising increasing the bandwidth indicator by an amount if all content datagrams of a batch are received correctly.
20. A computer-readable device comprising instructions, which, when loaded and executed by a processor, cause the processor to perform operations, the operations comprising:
receiving, from a client system, a first request datagram sent to an anycast internet protocol address, wherein the first request datagram includes a bandwidth indicator that is provided based on occurrence of a timeout; and
transmitting, to the client system and in response to the first request datagram, a first content datagram including a portion of content.