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_AUTOSCALING_POLICY_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "
GOOGLE_CLOUD_CPP_BATCH_CONTROLLER_ENDPOINT=...overrides theEndpointOption(which defaults to "
GOOGLE_CLOUD_CPP_CLUSTER_CONTROLLER_ENDPOINT=...overrides theEndpointOption(which defaults to "
GOOGLE_CLOUD_CPP_JOB_CONTROLLER_ENDPOINT=...overrides theEndpointOption(which defaults to "
GOOGLE_CLOUD_CPP_NODE_GROUP_CONTROLLER_ENDPOINT=...overrides theEndpointOption(which defaults to "
GOOGLE_CLOUD_CPP_WORKFLOW_TEMPLATE_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "
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\u003eThe latest release candidate version for the library is 2.37.0-rc, with version 2.21.0 being the current base version mentioned on the page, and many other versions listed in between the two.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can be utilized to modify the behavior of the library, offering a practical approach to troubleshooting and adjusting settings.\u003c/p\u003e\n"],["\u003cp\u003eMultiple environment variables can be used to override the default endpoint options, including specific endpoints for Autocalings, Batch, Cluster, Job, Node Group Controllers, and Workflow Template Services.\u003c/p\u003e\n"],["\u003cp\u003eTracing and logging can be enabled and configured through environment variables like \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e and \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e, allowing for detailed monitoring of gRPC calls and library activities.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e can be set through an environment variable to set the default project for the examples and tests.\u003c/p\u003e\n"]]],[],null,["Version 2.21.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/dataproc/latest/dataproc-env)\n- [2.41.0](/cpp/docs/reference/dataproc/2.41.0/dataproc-env)\n- [2.40.0](/cpp/docs/reference/dataproc/2.40.0/dataproc-env)\n- [2.39.0](/cpp/docs/reference/dataproc/2.39.0/dataproc-env)\n- [2.38.0](/cpp/docs/reference/dataproc/2.38.0/dataproc-env)\n- [2.37.0](/cpp/docs/reference/dataproc/2.37.0/dataproc-env)\n- [2.36.0](/cpp/docs/reference/dataproc/2.36.0/dataproc-env)\n- [2.35.0](/cpp/docs/reference/dataproc/2.35.0/dataproc-env)\n- [2.34.0](/cpp/docs/reference/dataproc/2.34.0/dataproc-env)\n- [2.33.0](/cpp/docs/reference/dataproc/2.33.0/dataproc-env)\n- [2.32.0](/cpp/docs/reference/dataproc/2.32.0/dataproc-env)\n- [2.31.0](/cpp/docs/reference/dataproc/2.31.0/dataproc-env)\n- [2.30.0](/cpp/docs/reference/dataproc/2.30.0/dataproc-env)\n- [2.29.0](/cpp/docs/reference/dataproc/2.29.0/dataproc-env)\n- [2.28.0](/cpp/docs/reference/dataproc/2.28.0/dataproc-env)\n- [2.27.0](/cpp/docs/reference/dataproc/2.27.0/dataproc-env)\n- [2.26.0](/cpp/docs/reference/dataproc/2.26.0/dataproc-env)\n- [2.25.1](/cpp/docs/reference/dataproc/2.25.1/dataproc-env)\n- [2.24.0](/cpp/docs/reference/dataproc/2.24.0/dataproc-env)\n- [2.23.0](/cpp/docs/reference/dataproc/2.23.0/dataproc-env)\n- [2.22.1](/cpp/docs/reference/dataproc/2.22.1/dataproc-env)\n- [2.21.0](/cpp/docs/reference/dataproc/2.21.0/dataproc-env)\n- [2.20.0](/cpp/docs/reference/dataproc/2.20.0/dataproc-env)\n- [2.19.0](/cpp/docs/reference/dataproc/2.19.0/dataproc-env)\n- [2.18.0](/cpp/docs/reference/dataproc/2.18.0/dataproc-env)\n- [2.17.0](/cpp/docs/reference/dataproc/2.17.0/dataproc-env)\n- [2.16.0](/cpp/docs/reference/dataproc/2.16.0/dataproc-env)\n- [2.15.1](/cpp/docs/reference/dataproc/2.15.1/dataproc-env)\n- [2.14.0](/cpp/docs/reference/dataproc/2.14.0/dataproc-env)\n- [2.13.0](/cpp/docs/reference/dataproc/2.13.0/dataproc-env)\n- [2.12.0](/cpp/docs/reference/dataproc/2.12.0/dataproc-env)\n- [2.11.0](/cpp/docs/reference/dataproc/2.11.0/dataproc-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_AUTOSCALING_POLICY_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"\n- `GOOGLE_CLOUD_CPP_BATCH_CONTROLLER_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"\n- `GOOGLE_CLOUD_CPP_CLUSTER_CONTROLLER_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"\n- `GOOGLE_CLOUD_CPP_JOB_CONTROLLER_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"\n- `GOOGLE_CLOUD_CPP_NODE_GROUP_CONTROLLER_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"\n- `GOOGLE_CLOUD_CPP_WORKFLOW_TEMPLATE_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"\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."]]
