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_DATAPROC_METASTORE_ENDPOINT=... overrides the EndpointOption (which defaults to "metastore.googleapis.com") used by MakeDataprocMetastoreConnection().
GOOGLE_CLOUD_CPP_DATAPROC_METASTORE_FEDERATION_ENDPOINT=... overrides the EndpointOption (which defaults to "metastore.googleapis.com") used by MakeDataprocMetastoreFederationConnection().
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 release candidate version for the metastore environment is 2.37.0-rc, and the page provides links to documentation for versions ranging from 2.37.0-rc down to 2.13.0."],["Environment variables can be used to configure the library's behavior and troubleshoot problems, offering an alternative to in-code configuration."],["`GOOGLE_CLOUD_CPP_DATAPROC_METASTORE_ENDPOINT` and `GOOGLE_CLOUD_CPP_DATAPROC_METASTORE_FEDERATION_ENDPOINT` can override the default endpoint used by the `MakeDataprocMetastoreConnection()` and `MakeDataprocMetastoreFederationConnection()` respectively."],["Tracing for gRPC calls can be enabled by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and for output on the console, `GOOGLE_CLOUD_CPP_ENABLE_CLOG` should also be set."],["Setting the default project can be done by setting `GOOGLE_CLOUD_PROJECT=...` to configure the GCP project, however this does not have an effect on the library."]]],[]]
