on darwin fallback to maximum possible rlimit (#9859)

fixes #9857

pkg/sys/rlimit-file_nix.go

@@ -18,7 +18,10 @@
 
 package sys
 
-import "syscall"
+import (
+	"runtime"
+	"syscall"
+)
 
 // GetMaxOpenFileLimit - returns maximum file descriptor number that can be opened by this process.
 func GetMaxOpenFileLimit() (curLimit, maxLimit uint64, err error) {
@@ -33,6 +36,13 @@ func GetMaxOpenFileLimit() (curLimit, maxLimit uint64, err error) {
 
 // SetMaxOpenFileLimit - sets maximum file descriptor number that can be opened by this process.
 func SetMaxOpenFileLimit(curLimit, maxLimit uint64) error {
+	if runtime.GOOS == "darwin" && curLimit > 10240 {
+		// The max file limit is 10240, even though
+		// the max returned by Getrlimit is 1<<63-1.
+		// This is OPEN_MAX in sys/syslimits.h.
+		// refer https://github.com/golang/go/issues/30401
+		curLimit = 10240
+	}
 	rlimit := syscall.Rlimit{Cur: curLimit, Max: maxLimit}
 	return syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rlimit)
 }