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_DATA_CATALOG_ENDPOINT=... overrides the EndpointOption (which defaults to "datacatalog.googleapis.com") used by MakeDataCatalogConnection().
GOOGLE_CLOUD_CPP_LINEAGE_ENDPOINT=... overrides the EndpointOption (which defaults to "datalineage.googleapis.com") used by MakeLineageConnection().
GOOGLE_CLOUD_CPP_POLICY_TAG_MANAGER_ENDPOINT=... overrides the EndpointOption (which defaults to "datacatalog.googleapis.com") used by MakePolicyTagManagerConnection().
GOOGLE_CLOUD_CPP_POLICY_TAG_MANAGER_SERIALIZATION_ENDPOINT=... overrides the EndpointOption (which defaults to "datacatalog.googleapis.com") used by MakePolicyTagManagerSerializationConnection().
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 2025-04-17 UTC."],[[["The latest version of the Data Catalog library is 2.37.0-rc, with several prior versions available, ranging from 2.36.0 down to 2.11.0, accessible via provided links."],["Environment variables can be used to configure the library's behavior, offering convenience when troubleshooting, and can override default settings."],["Endpoint overrides for Data Catalog, Lineage, and Policy Tag Manager are configurable using environment variables such as `GOOGLE_CLOUD_CPP_DATA_CATALOG_ENDPOINT`, `GOOGLE_CLOUD_CPP_LINEAGE_ENDPOINT`, `GOOGLE_CLOUD_CPP_POLICY_TAG_MANAGER_ENDPOINT`, and `GOOGLE_CLOUD_CPP_POLICY_TAG_MANAGER_SERIALIZATION_ENDPOINT`."],["Tracing for gRPC calls can be enabled via `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and logging can be enabled with `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes`, which outputs logs to the console, otherwise a user set backend is needed."],["The `GOOGLE_CLOUD_PROJECT` environment variable can be set to configure the GCP project for use in examples and integration tests."]]],[]]
