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_ADMIN_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "pubsublite.googleapis.com") used by MakeAdminServiceConnection().
GOOGLE_CLOUD_CPP_TOPIC_STATS_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "pubsublite.googleapis.com") used by MakeTopicStatsServiceConnection().
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::TracingComponentsOptionGOOGLE_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 2025-05-07 UTC."],[[["The latest version of the Pub/Sub Lite C++ library is 2.37.0-rc, with a range of other versions available from 2.36.0 down to 2.11.0."],["Environment variables can be used to configure the behavior of the library, offering a troubleshooting convenience, and can override default settings."],["The `GOOGLE_CLOUD_CPP_ADMIN_SERVICE_ENDPOINT` and `GOOGLE_CLOUD_CPP_TOPIC_STATS_SERVICE_ENDPOINT` environment variables can be used to override the default endpoint for the Admin Service and Topic Stats Service, respectively."],["Tracing for gRPC calls can be enabled using the `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc` environment variable, and the `GOOGLE_CLOUD_CPP_ENABLE_CLOG` variable can also be set to produce console output."],["While the `GOOGLE_CLOUD_PROJECT` environment variable is used in examples and integration tests to configure the GCP project, it does not affect the library's functionality."]]],[]]
