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_CONNECTORS_ENDPOINT=...overrides theEndpointOption(which defaults to "connectors.googleapis.com") used byMakeConnectorsConnection().
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 setGOOGLE_CLOUD_CPP_ENABLE_CLOGto 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 2025-09-04 UTC."],[[["\u003cp\u003eThis document provides reference information for the Connectors library, with version 2.37.0-rc being the latest release candidate, and a list of previous versions available for review down to version 2.11.0.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can be utilized to modify the behavior of the library, which is useful when debugging issues, or to set the endpoint used by the connectors, such as by using \u003ccode\u003eGOOGLE_CLOUD_CPP_CONNECTORS_ENDPOINT\u003c/code\u003e to override the default endpoint.\u003c/p\u003e\n"],["\u003cp\u003eLogging and tracing can be enabled and configured via environment variables like \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e, \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e, and \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e, and these options allow for detailed observation of the library's operation.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e environment variable can be used in examples and tests to specify a GCP project, but it does not affect the behavior of the library itself.\u003c/p\u003e\n"]]],[],null,["Version 2.11.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/connectors/latest/connectors-env)\n- [2.41.0](/cpp/docs/reference/connectors/2.41.0/connectors-env)\n- [2.40.0](/cpp/docs/reference/connectors/2.40.0/connectors-env)\n- [2.39.0](/cpp/docs/reference/connectors/2.39.0/connectors-env)\n- [2.38.0](/cpp/docs/reference/connectors/2.38.0/connectors-env)\n- [2.37.0](/cpp/docs/reference/connectors/2.37.0/connectors-env)\n- [2.36.0](/cpp/docs/reference/connectors/2.36.0/connectors-env)\n- [2.35.0](/cpp/docs/reference/connectors/2.35.0/connectors-env)\n- [2.34.0](/cpp/docs/reference/connectors/2.34.0/connectors-env)\n- [2.33.0](/cpp/docs/reference/connectors/2.33.0/connectors-env)\n- [2.32.0](/cpp/docs/reference/connectors/2.32.0/connectors-env)\n- [2.31.0](/cpp/docs/reference/connectors/2.31.0/connectors-env)\n- [2.30.0](/cpp/docs/reference/connectors/2.30.0/connectors-env)\n- [2.29.0](/cpp/docs/reference/connectors/2.29.0/connectors-env)\n- [2.28.0](/cpp/docs/reference/connectors/2.28.0/connectors-env)\n- [2.27.0](/cpp/docs/reference/connectors/2.27.0/connectors-env)\n- [2.26.0](/cpp/docs/reference/connectors/2.26.0/connectors-env)\n- [2.25.1](/cpp/docs/reference/connectors/2.25.1/connectors-env)\n- [2.24.0](/cpp/docs/reference/connectors/2.24.0/connectors-env)\n- [2.23.0](/cpp/docs/reference/connectors/2.23.0/connectors-env)\n- [2.22.1](/cpp/docs/reference/connectors/2.22.1/connectors-env)\n- [2.21.0](/cpp/docs/reference/connectors/2.21.0/connectors-env)\n- [2.20.0](/cpp/docs/reference/connectors/2.20.0/connectors-env)\n- [2.19.0](/cpp/docs/reference/connectors/2.19.0/connectors-env)\n- [2.18.0](/cpp/docs/reference/connectors/2.18.0/connectors-env)\n- [2.17.0](/cpp/docs/reference/connectors/2.17.0/connectors-env)\n- [2.16.0](/cpp/docs/reference/connectors/2.16.0/connectors-env)\n- [2.15.1](/cpp/docs/reference/connectors/2.15.1/connectors-env)\n- [2.14.0](/cpp/docs/reference/connectors/2.14.0/connectors-env)\n- [2.13.0](/cpp/docs/reference/connectors/2.13.0/connectors-env)\n- [2.12.0](/cpp/docs/reference/connectors/2.12.0/connectors-env)\n- [2.11.0](/cpp/docs/reference/connectors/2.11.0/connectors-env) \n\nEnvironment Variables\n=====================\n\nA 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.\n\nEndpoint Overrides\n------------------\n\n- `GOOGLE_CLOUD_CPP_CONNECTORS_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"connectors.googleapis.com\") used by `MakeConnectorsConnection()`.\n\n###### See Also\n\n[`google::cloud::EndpointOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1EndpointOption.html)\n\nLogging\n-------\n\n`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.\n\n###### See Also\n\n[`google::cloud::TracingComponentsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1TracingComponentsOption.html)`GOOGLE_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.\n\n###### See Also\n\n[`google::cloud::GrpcTracingOptionsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1GrpcTracingOptionsOption.html)`GOOGLE_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.\n\n###### See Also\n\n[`google::cloud::LogBackend`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogBackend.html)\n\n###### See Also\n\n[`google::cloud::LogSink`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogSink.html)\n\nSetting the Default Project\n---------------------------\n\n`GOOGLE_CLOUD_PROJECT=...`: is used in examples and integration tests to configure the GCP project. This has no effect in the library."]]
