Function set_join_set_tracer

datafusion/common-runtime/src/trace_utils.rs:110–116

Set the custom tracer for both futures and blocking closures. This should be called once at startup. If called more than once, an `Err(JoinSetTracerError)` is returned. If not called at all, a no-op tracer that does nothing is used.

(
    tracer: &'static dyn JoinSetTracer,
)

/// `Err(JoinSetTracerError)` is returned. If not called at all, a no-op tracer that does nothing
/// is used.
pub fn set_join_set_tracer(
    tracer: &'static dyn JoinSetTracer,
) -> Result<(), JoinSetTracerError> {
    GLOBAL_TRACER
        .set(tracer)
        .map_err(|_set_err| JoinSetTracerError::AlreadySet)
}

/// Optionally instruments a future with custom tracing.
///