client/picker: log loop to V(2) (#8863)

atollena · web-flow · commit 0dc1bcd13eae · 2026-01-29T17:25:31.000+05:30
The log for looping when the picked transport is not ready is
unnecessarily expensive (this show up in our profiles on some edge
cases). Condition it to V(2).

RELEASE NOTES: N/A
diff --git a/picker_wrapper.go b/picker_wrapper.go
@@ -192,7 +192,9 @@ func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.
 			// DoneInfo with default value works.
 			pickResult.Done(balancer.DoneInfo{})
 		}
-		logger.Infof("blockingPicker: the picked transport is not ready, loop back to repick")
+		if logger.V(2) {
+			logger.Infof("blockingPicker: the picked transport is not ready, loop back to repick")
+		}
 		// If ok == false, ac.state is not READY.
 		// A valid picker always returns READY subConn. This means the state of ac
 		// just changed, and picker will be updated shortly.
