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 2025-03-21 UTC."],[[["This document provides reference information for the Data Migration service, detailing its behavior and configuration through environment variables and code."],["The latest version of the Data Migration service is version 2.37.0-rc, while the current page's version is 2.28.0, and older versions dating back to 2.11.0 are also listed, with their corresponding links."],["Environment variables like `GOOGLE_CLOUD_CPP_DATA_MIGRATION_SERVICE_ENDPOINT` can override default endpoints, and variables like `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` enable tracing and logging for troubleshooting."],["The document outlines how to configure the library's logging behavior and tracing of gRPC calls via environment variables, including options for message formatting and the output of tracing data."],["The environment variable `GOOGLE_CLOUD_PROJECT` is used for examples and tests to configure the GCP project but does not have any effect on the actual library."]]],[]]
