Reference documentation and code samples for the Compute Engine v1 API enum BackendServiceLocalityLoadBalancingPolicyConfigPolicy.Types.Name.
The name of a locality load-balancing policy. Valid values include ROUND_ROBIN and, for Java clients, LEAST_REQUEST. For information about these values, see the description of localityLbPolicy. Do not specify the same policy more than once for a backend. If you do, the configuration is rejected.
An O(1) algorithm which selects two random healthy hosts and picks the host which has fewer active requests.
Maglev
This algorithm implements consistent hashing to backends. Maglev can be used as a drop in replacement for the ring hash load balancer. Maglev is not as stable as ring hash but has faster table lookup build times and host selection times. For more information about Maglev, see https://ai.google/research/pubs/pub44824
OriginalDestination
Backend host is selected based on the client connection metadata, i.e., connections are opened to the same address as the destination address of the incoming connection before the connection was redirected to the load balancer.
Random
The load balancer selects a random healthy host.
RingHash
The ring/modulo hash load balancer implements consistent hashing to backends. The algorithm has the property that the addition/removal of a host from a set of N hosts only affects 1/N of the requests.
RoundRobin
This is a simple policy in which each healthy backend is selected in round robin order. This is the default.
UndefinedName
A value indicating that the enum field is not set.
WeightedMaglev
Per-instance weighted Load Balancing via health check reported weights. If set, the Backend Service must configure a non legacy HTTP-based Health Check, and health check replies are expected to contain non-standard HTTP response header field X-Load-Balancing-Endpoint-Weight to specify the per-instance weights. If set, Load Balancing is weighted based on the per-instance weights reported in the last processed health check replies, as long as every instance either reported a valid weight or had UNAVAILABLE_WEIGHT. Otherwise, Load Balancing remains equal-weight. This option is only supported in Network Load Balancing.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-08 UTC."],[[["\u003cp\u003eThis document provides reference information for the \u003ccode\u003eBackendServiceLocalityLoadBalancingPolicyConfigPolicy.Types.Name\u003c/code\u003e enum within the Google.Cloud.Compute.V1 API, covering multiple versions from 1.0.0 to the latest 3.6.0.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eBackendServiceLocalityLoadBalancingPolicyConfigPolicy.Types.Name\u003c/code\u003e enum defines various locality load-balancing policies, including \u003ccode\u003eROUND_ROBIN\u003c/code\u003e, \u003ccode\u003eLEAST_REQUEST\u003c/code\u003e, \u003ccode\u003eMAGLEV\u003c/code\u003e, \u003ccode\u003eORIGINAL_DESTINATION\u003c/code\u003e, \u003ccode\u003eRANDOM\u003c/code\u003e, \u003ccode\u003eRING_HASH\u003c/code\u003e, \u003ccode\u003eWEIGHTED_MAGLEV\u003c/code\u003e, \u003ccode\u003eINVALID_LB_POLICY\u003c/code\u003e, and \u003ccode\u003eUNDEFINED_NAME\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version of this enum is 3.6.0, and it includes details on how each policy selects backend hosts, such as \u003ccode\u003eROUND_ROBIN\u003c/code\u003e which picks each healthy backend in turn, and \u003ccode\u003eMAGLEV\u003c/code\u003e, which implements consistent hashing.\u003c/p\u003e\n"],["\u003cp\u003eThe document details the functionality of the \u003ccode\u003eWEIGHTED_MAGLEV\u003c/code\u003e policy, which is based on health check reported weights and can only be supported in network load balancing.\u003c/p\u003e\n"],["\u003cp\u003eDifferent policy versions are available, and can be accesssed via their corresponding hyperlinks, which may contain differences in the functions of each policy.\u003c/p\u003e\n"]]],[],null,[]]
