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::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 2025-08-14 UTC."],[[["\u003cp\u003eThe latest version of the Data Catalog environment is 2.37.0-rc, with several prior versions available for reference, including 2.36.0, 2.35.0, and many more down to 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables such as \u003ccode\u003eGOOGLE_CLOUD_CPP_DATA_CATALOG_ENDPOINT\u003c/code\u003e, \u003ccode\u003eGOOGLE_CLOUD_CPP_LINEAGE_ENDPOINT\u003c/code\u003e, \u003ccode\u003eGOOGLE_CLOUD_CPP_POLICY_TAG_MANAGER_ENDPOINT\u003c/code\u003e, and \u003ccode\u003eGOOGLE_CLOUD_CPP_POLICY_TAG_MANAGER_SERIALIZATION_ENDPOINT\u003c/code\u003e can override default endpoint options for different connections.\u003c/p\u003e\n"],["\u003cp\u003eTracing for gRPC calls can be enabled using \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e, and alongside this, setting \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e will help produce the output to the program's console.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...\u003c/code\u003e can be used to modify the behavior of gRPC tracing, for example how the messages are presented.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes\u003c/code\u003e turns on the logging in the library to print output, as by default the logging has no backend, so no logs are printed.\u003c/p\u003e\n"]]],[],null,[]]
