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_DATA_FUSION_ENDPOINT=... overrides the EndpointOption (which defaults to "datafusion.googleapis.com") used by MakeDataFusionConnection().
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"]],[["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 2025-03-05 UTC."],[[["This document provides a comprehensive list of DataFusion library versions, starting from the latest release candidate, 2.37.0-rc, and going down to version 2.13.0, each linked to its respective documentation."],["Environment variables like `GOOGLE_CLOUD_CPP_DATA_FUSION_ENDPOINT`, `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` can be utilized to configure and troubleshoot the DataFusion library's behavior, such as overriding the default endpoint and enabling tracing or logging."],["The `GOOGLE_CLOUD_PROJECT` environment variable is used in examples and tests to set the GCP project, however it has no impact on the library's functionality."],["`GOOGLE_CLOUD_CPP_TRACING_OPTIONS` allows for customization of gRPC tracing behavior, such as formatting and truncation of output."],["Tracing can be enabled for most gRPC calls by using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, while enabling logging in the library can be done with `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes`."]]],[]]
