Option for google::cloud::Options to indicate which replicas or regions should be used for reads/queries in read-only or single-use transactions.
Use of DirectedReadOptions within a read-write transaction will result in a kInvalidArgument error.
The IncludeReplicas variant lists the replicas to try (in order) to process the request, and what to do if the list is exhausted without finding a healthy replica.
Alternately, the ExcludeReplicas variant lists replicas that should be excluded from serving the request.
Type Aliases
Type
Alias Of: absl::variant< absl::monostate, IncludeReplicas, ExcludeReplicas >
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-14 UTC."],[[["This webpage provides documentation for the `DirectedReadOption` feature in the Google Cloud Spanner C++ library across multiple versions, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc."],["`DirectedReadOption` allows users to specify which replicas or regions to utilize when performing read-only or single-use transactions, optimizing query execution."],["Attempting to use `DirectedReadOption` in read-write transactions will result in an error, specifically a `kInvalidArgument` error."],["The feature supports two variants: `IncludeReplicas` to specify a list of preferred replicas, and `ExcludeReplicas` to specify a list of replicas that should be avoided."],["The type alias for the `DirectedReadOption` is defined as `absl::variant\u003c absl::monostate, IncludeReplicas, ExcludeReplicas \u003e`, representing the different possible configurations."]]],[]]
