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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 OverridesGOOGLE_CLOUD_CPP_EXECUTIONS_ENDPOINT=... overrides the EndpointOption (which defaults to "run.googleapis.com") used by MakeExecutionsConnection().GOOGLE_CLOUD_CPP_JOBS_ENDPOINT=... overrides the EndpointOption (which defaults to "run.googleapis.com") used by MakeJobsConnection().GOOGLE_CLOUD_CPP_REVISIONS_ENDPOINT=... overrides the EndpointOption (which defaults to "run.googleapis.com") used by MakeRevisionsConnection().GOOGLE_CLOUD_CPP_RUN_SERVICES_ENDPOINT=... overrides the EndpointOption (which defaults to "run.googleapis.com") used by MakeServicesConnection().GOOGLE_CLOUD_CPP_TASKS_ENDPOINT=... overrides the EndpointOption (which defaults to "run.googleapis.com") used by MakeTasksConnection().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.
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.
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.
GOOGLE_CLOUD_PROJECT=...: is used in examples and integration tests to configure the GCP project. This has no effect in the library.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-14 UTC.
[[["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."],[[["This page provides documentation for various versions of the C++ library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["Several environment variables allow users to customize the library's behavior, especially useful for troubleshooting issues."],["Endpoint overrides, like `GOOGLE_CLOUD_CPP_EXECUTIONS_ENDPOINT`, allow users to modify the default endpoints for different service connections."],["Logging can be enabled and customized using environment variables such as `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, allowing users to track and monitor library activity."],["While `GOOGLE_CLOUD_PROJECT` can be used for examples and testing, it does not affect the core functionality of the library."]]],[]]
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