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_MIGRATION_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "datamigration.googleapis.com") used by MakeDataMigrationServiceConnection().
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 version-specific documentation for the Data Migration environment, with the latest version being 2.37.0-rc."],["Environment variables like `GOOGLE_CLOUD_CPP_DATA_MIGRATION_SERVICE_ENDPOINT` can be used to override default endpoint settings, enabling configuration of the library's behavior."],["Tracing for gRPC calls can be enabled via `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, which, when combined with `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, will output gRPC request and response details to the console."],["The environment variable `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` can be used to change how the gRPC tracing messages are displayed."],["The `GOOGLE_CLOUD_PROJECT` variable is used to configure the GCP project in examples and integration tests, but does not affect the library."]]],[]]
