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_DATASTREAM_ENDPOINT=... overrides the EndpointOption (which defaults to "datastream.googleapis.com") used by MakeDatastreamConnection().
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."],[[["The latest version of the datastream library is 2.37.0-rc, as indicated by the provided version list, and there are multiple previous versions available for reference, ranging from 2.36.0 down to 2.11.0."],["Environment variables can be utilized to customize the behavior of the datastream library, providing a way to adjust settings or troubleshoot issues."],["The `GOOGLE_CLOUD_CPP_DATASTREAM_ENDPOINT` environment variable allows users to override the default endpoint used by `MakeDatastreamConnection()`."],["Tracing for gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, which helps in monitoring the request and response behavior, and can be configured to output on the console with `GOOGLE_CLOUD_CPP_ENABLE_CLOG`."],["The environment variable `GOOGLE_CLOUD_PROJECT` can be used in test and examples, but does not affect the library's functionality."]]],[]]
