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::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"]],[["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 2025-04-17 UTC."],[[["This document provides environment variable configurations and version history for the Dataproc Metastore library, with the latest version being 2.37.0-rc."],["Environment variables like `GOOGLE_CLOUD_CPP_DATAPROC_METASTORE_ENDPOINT` and `GOOGLE_CLOUD_CPP_DATAPROC_METASTORE_FEDERATION_ENDPOINT` allow overriding the default endpoint settings for the library."],["Tracing and logging behavior can be controlled via environment variables such as `GOOGLE_CLOUD_CPP_ENABLE_TRACING`, `GOOGLE_CLOUD_CPP_TRACING_OPTIONS`, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, providing detailed control over gRPC calls and logging output."],["The document lists various past versions of the library from 2.13.0 up to 2.36.0, as well as the latest release candidate version."]]],[]]
