A number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.
Endpoint Overrides
GOOGLE_CLOUD_CPP_RECOMMENDER_ENDPOINT=... overrides the EndpointOption (which defaults to "recommender.googleapis.com") used by MakeRecommenderConnection().
GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also set GOOGLE_CLOUD_CPP_ENABLE_CLOG to produce any output on the program's console.
See Also
google::cloud::LoggingComponentsOptionGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.
See Also
google::cloud::GrpcTracingOptionsOptionGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes: turns on logging in the library, basically the library always "logs" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.
[[["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 2025-03-05 UTC."],[[["This document provides reference information for the Recommender C++ library, detailing various available versions from 2.11.0 up to the latest release candidate 2.37.0-rc."],["The library's behavior can be configured using environment variables, especially useful for troubleshooting, offering options such as `GOOGLE_CLOUD_CPP_RECOMMENDER_ENDPOINT` for endpoint overrides."],["Tracing for gRPC calls can be enabled with `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and this often requires `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to be set for output to be visible on the console."],["The behavior of the gRPC tracing output is customizable through `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, allowing control over message formatting and field truncation."],["`GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes` enables logging in the library, which by default doesn't have an output, and is a necessary step to visualize any logs."]]],[]]
