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_BATCH_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "batch.googleapis.com") used by MakeBatchServiceConnection().
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"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis document provides reference information for different versions of the C++ Batch library, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can be utilized to configure the library's behavior, including \u003ccode\u003eGOOGLE_CLOUD_CPP_BATCH_SERVICE_ENDPOINT\u003c/code\u003e for endpoint overrides, \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e for enabling gRPC call tracing, and \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e for enabling library logging.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e environment variable allows for the modification of gRPC tracing behavior, such as message output format and string/bytes field truncation.\u003c/p\u003e\n"],["\u003cp\u003eThe environment variable \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e can be used for examples and integration tests to configure the GCP project, though it has no effect within the library.\u003c/p\u003e\n"],["\u003cp\u003eThis guide links to further documentation regarding the \u003ccode\u003eEndpointOption\u003c/code\u003e, \u003ccode\u003eTracingComponentsOption\u003c/code\u003e, \u003ccode\u003eGrpcTracingOptionsOption\u003c/code\u003e, \u003ccode\u003eLogBackend\u003c/code\u003e, and \u003ccode\u003eLogSink\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,[]]
