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 the EndpointOption (which defaults to "
GOOGLE_CLOUD_CPP_BATCH_CONTROLLER_ENDPOINT=... overrides the EndpointOption (which defaults to "
GOOGLE_CLOUD_CPP_CLUSTER_CONTROLLER_ENDPOINT=... overrides the EndpointOption (which defaults to "
GOOGLE_CLOUD_CPP_JOB_CONTROLLER_ENDPOINT=... overrides the EndpointOption (which defaults to "
GOOGLE_CLOUD_CPP_WORKFLOW_TEMPLATE_SERVICE_ENDPOINT=... overrides the EndpointOption (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 set GOOGLE_CLOUD_CPP_ENABLE_CLOG to 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 2025-04-09 UTC."],[[["This document provides version-specific documentation for the Dataproc C++ client library, with the latest release being version 2.37.0-rc."],["The behavior of the library can be customized using several environment variables, which are particularly useful for troubleshooting purposes."],["Endpoint overrides for various Dataproc services, such as Autoscailing Policy, Batch Controller, Cluster Controller, Job Controller, and Workflow Template, can be set using environment variables like `GOOGLE_CLOUD_CPP_AUTOSCALING_POLICY_SERVICE_ENDPOINT`."],["Tracing and logging capabilities can be enabled and configured via environment variables such as `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, allowing for detailed monitoring of gRPC calls and library activity."],["While the `GOOGLE_CLOUD_PROJECT` environment variable is used in examples and integration tests, it does not directly impact the library's functionality."]]],[]]
