System and method for throttling service requests having non-uniform workloads

Patent metadata

Field	Value
Publication number	US-2019306255-A1
Application number	US-201916377078-A
Country	US
Kind code	A1
Filing date	Apr 5, 2019
Priority date	Dec 15, 2011
Publication date	Oct 3, 2019
Grant date	—

Abstract

A system that provides services to clients may receive and service requests, various ones of which may require different amounts of work. The system may determine whether it is operating in an overloaded or underloaded state based on a current work throughput rate, a target work throughput rate, a maximum request rate, or an actual request rate, and may dynamically adjust the maximum request rate in response. For example, if the maximum request rate is being exceeded, the maximum request rate may be raised or lowered, dependent on the current work throughput rate. If the target or committed work throughput rate is being exceeded, but the maximum request rate is not being exceeded, a lower maximum request rate may be proposed. Adjustments to the maximum request rate may be made using multiple incremental adjustments. Service request tokens may be added to a leaky token bucket at the maximum request rate.

First claim

1 .- 35 . (canceled)

36 . A system, comprising:
at least one processor; and a memory storing program instructions that when executed by the at least one processor cause the at least one processor to implement a network-based service, the network-based service configured to:
receive a plurality of service requests at a network-based service;
service a portion of the plurality of service requests at the network-based service according to a user specified throughput to service requests at the network-based service and within a maximum allowable request rate;
determine respective numbers of units of work performed to service individual requests of the portion of the plurality of service requests at the network-based service;
compare, at the network-based service, an observed rate of the respective numbers of units of work performed to service the portion of the plurality of service requests with respect to a target rate determined based, at least in part, on the user specified throughput to service requests at the network-based service;
based, at least in part, on the comparison, adjust the maximum allowable request rate; and
subsequent to said adjustment:
receive one or more additional service requests at the network-based service; and
service a portion of the additional service requests at the network-based service according to the user specified throughput and within the adjusted maximum allowable request rate.

37 . The system of claim 36 ,
wherein the comparison of the observed rate with the target rate determines that the observed rate exceeds the target rate; and wherein to adjust the maximum allowable request rate, the network-based service is configured to:
determine an amount by which to lower the maximum allowable request rate; and
lower the maximum allowable request rate by the determined amount.

38 . The system of claim 36 ,
wherein the comparison of the observed rate with the target rate determines that the observed rate is less than the target rate; and wherein to adjust the maximum allowable request rate, the network-based service is configured to:
determine an amount by which to raise the maximum allowable request rate; and
raise the maximum request rate by the determined amount.

39 . The system of claim 36 , wherein to adjust the maximum allowable request rate, the network-based service is configured to:
determine a rejection rate for those service requests of the plurality of service requests; and dependent on the rejection rate, calculate an amount by which the maximum allowable request rate is adjusted is determined.

40 . The system of claim 36 ,
wherein the plurality of service requests and the additional service requests are access requests directed toward a partition of multiple partitions of a database table maintained on behalf of one or more clients at the network-based service; wherein the network-based service is further configured to:
prior to receiving the plurality of service requests, initialize the maximum allowable request rate, wherein the maximum allowable request rate is initialized according to the user specified throughput level, and wherein the observed rate at which work was performed is a data transfer rate required to satisfy the portion of the service requests.

41 . The system of claim 36 , wherein the adjustment of the maximum allowable request rate is further based on a received request to change a service level agreement.

42 . The system of claim 36 , wherein the plurality of service requests and the additional service requests are one type of service request, wherein the maximum allowable request rate is specific to accept service requests of the one type of service request, wherein the receiving, the servicing, the determining, the comparing, the adjusting, and the subsequent receiving and servicing are performed for another plurality of service requests of a different type of service request than the one type such that another maximum allowable request rate specific to the different type of service request is adjusted to service requests of the different type of service request.

43 . A method, comprising:
receiving a plurality of service requests at a network-based service; servicing a portion of the plurality of service requests at the network-based service according to a user specified throughput to service requests at the network-based service and within a maximum allowable request rate; determining respective numbers of units of work performed to service individual requests of the portion of the plurality of service requests at the network-based service; comparing, at the network-based service, an observed rate of the respective numbers of units of work performed to service the portion of the plurality of service requests with respect to a target rate determined based, at least in part, on the user specified throughput to service requests at the network-based service; based, at least in part, on the comparison, adjusting the maximum allowable request rate; and subsequent to said adjusting:
receiving one or more additional service requests at the network-based service; and
servicing a portion of the additional service requests at the network-based service according to the user specified throughput and within the adjusted maximum allowable request rate.

44 . The method of claim 43 ,
wherein the comparison of the observed rate with the target rate determines that the observed rate exceeds the target rate; and wherein adjusting the maximum allowable request rate, comprises:
determining an amount by which to lower the maximum allowable request rate; and
lowering the maximum allowable request rate by the determined amount.

45 . The method of claim 43 ,
wherein the comparison of the observed rate with the target rate determines that the observed rate is less than the target rate; and wherein adjusting the maximum allowable request rate, comprises:
determining an amount by which to raise the maximum allowable request rate; and
raising the maximum request rate by the determined amount.

46 . The method of claim 43 , wherein adjusting the maximum allowable request rate, comprises:
determining a rejection rate for those service requests of the plurality of service requests; and dependent on the rejection rate, calculating an amount by which the maximum allowable request rate is adjusted is determined.

47 . The method of claim 43 ,
wherein the plurality of service requests and the additional service requests are access requests directed toward a partition of multiple partitions of a database table maintained on behalf of one or more clients at the network-based service; wherein the method further comprises:
prior to receiving the plurality of service requests, initializing the maximum allowable request rate, wherein the maximum allowable request rate is initialized according to the user specified throughput level, and wherein the observed rate at which work was performed is a data transfer rate required to satisfy the portion of the service requests.

48 . The method of claim 43 , wherein the adjustment of the maximum allowable request rate is further based on a received request to change a service level agreement.

49 . The method of claim 43 , wherein the plurality of service requests and the additional service requests are one type of service request, wherein the maximum allowable request rate is specific to accept service requests of the one type of service request, wherein the receiving, the servicing, the determining, the comparing, the adjusting, and the subsequent receiving and servicing

Assignees

• Amazon Tech Inc

Inventors

• Xiao Wei
• Lutz David Alan
• Rath Timothy Andrew
• Maccanti Maximiliano
• Filipe Miguel Mascarenhas
• Yanacek David Craig

Classifications

• H04L41/0896

  Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities (flow or congestion control using dynamic resource allocation, e.g. in-call renegotiation, H04L47/76) · CPC title

• G06F11/3433

  for load management (allocation of a server based on load conditions G06F9/505; load rebalancing G06F9/5083; redistributing the load in a network by a load balancer H04L67/1029) · CPC title

• G06F2209/504

  Resource capping · CPC title

• G06F2201/81

  Threshold · CPC title

• G06F11/3452

  Performance evaluation by statistical analysis · CPC title