Merge pull request #1424 from guozhao-coder/nsqd-freememory-api

nsqd: add debug http endpoint to release memory to OS

nsqd/http.go

@@ -13,6 +13,7 @@ import (
 	"os"
 	"reflect"
 	"runtime"
+	"runtime/debug"
 	"strconv"
 	"strings"
 	"time"
@@ -85,6 +86,7 @@ func newHTTPServer(nsqd *NSQD, tlsEnabled bool, tlsRequired bool) *httpServer {
 	router.Handler("GET", "/debug/pprof/goroutine", pprof.Handler("goroutine"))
 	router.Handler("GET", "/debug/pprof/block", pprof.Handler("block"))
 	router.Handle("PUT", "/debug/setblockrate", http_api.Decorate(setBlockRateHandler, log, http_api.PlainText))
+	router.Handle("POST", "/debug/freememory", http_api.Decorate(freeMemory, log, http_api.PlainText))
 	router.Handler("GET", "/debug/pprof/threadcreate", pprof.Handler("threadcreate"))
 
 	return s
@@ -99,6 +101,11 @@ func setBlockRateHandler(w http.ResponseWriter, req *http.Request, ps httprouter
 	return nil, nil
 }
 
+func freeMemory(w http.ResponseWriter, req *http.Request, ps httprouter.Params) (interface{}, error) {
+	debug.FreeOSMemory()
+	return nil, nil
+}
+
 func (s *httpServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	if !s.tlsEnabled && s.tlsRequired {
 		resp := fmt.Sprintf(`{"message": "TLS_REQUIRED", "https_port": %d}`,