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 the EndpointOption (which defaults to "connectors.googleapis.com") used by MakeConnectorsConnection().
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"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis document provides reference information for the C++ connectors library, spanning versions from 2.11.0 up to the latest release candidate 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can be leveraged to configure the behavior of the library, and the \u003ccode\u003eGOOGLE_CLOUD_CPP_CONNECTORS_ENDPOINT\u003c/code\u003e variable can override the default endpoint used by \u003ccode\u003eMakeConnectorsConnection()\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eTracing for gRPC calls can be enabled with the \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e variable, which allows you to see each request and response, and setting \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e will also be required to see any output.\u003c/p\u003e\n"],["\u003cp\u003eThe variable \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e modifies the behaviour of gRPC tracing, allowing for customization of the output format, as well as whether or not fields will be truncated.\u003c/p\u003e\n"],["\u003cp\u003eWhile the \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e environment variable is used in examples and integration tests, it does not affect the operation of the library itself.\u003c/p\u003e\n"]]],[],null,["Version 2.36.0keyboard_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::LoggingComponentsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1LoggingComponentsOption.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."]]
