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_TPU_ENDPOINT=... overrides the EndpointOption (which defaults to "tpu.googleapis.com") used by MakeTpuConnection().
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 2025-03-14 UTC."],[[["This page provides documentation for various versions of the TPU (Tensor Processing Unit) environment, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc."],["Users can configure the behavior of the library using environment variables, particularly useful for troubleshooting, or through in-code configuration."],["The `GOOGLE_CLOUD_CPP_TPU_ENDPOINT` environment variable allows overriding the default endpoint used by `MakeTpuConnection()`, which is typically \"tpu.googleapis.com\"."],["Enabling tracing for gRPC calls can be achieved by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` can be set to output any result of the logging on the program's console."],["The `GOOGLE_CLOUD_PROJECT` variable is used in examples and tests to configure the GCP project but does not impact the library's functionality directly."]]],[]]
