diff --git a/lualib/skynet/datasheet/builder.lua b/lualib/skynet/datasheet/builder.lua
index f3ffdf2a..ed2b7d47 100644
--- a/lualib/skynet/datasheet/builder.lua
+++ b/lualib/skynet/datasheet/builder.lua
@@ -80,6 +80,24 @@ local function releasehandle(handle)
 	end
 end
 
+local function register_collector(name)
+	local function collect()
+		local m = dataset[name].monitor
+		local i = 1
+		while m[i] do
+			if not m[i] "TEST" then
+				local n = #m
+				m[i] = m[n]
+				m[n] = nil
+			else
+				i = i + 1
+			end
+		end
+		skynet.timeout(10 * 60 * 100, collect)	-- 10 mins
+	end
+	collect()
+end
+
 -- from builder, create or update handle
 function datasheet.update(name, handle)
 	local t = dataset[name]
@@ -88,6 +106,7 @@ function datasheet.update(name, handle)
 		t = { handle = handle, monitor = {} }
 		dataset[name] = t
 		handles[handle] = { ref = 1, name = name }
+		register_collector(name)
 	else
 		t.handle = handle
 		-- report update to customers
diff --git a/test/testdatasheet.lua b/test/testdatasheet.lua
index 5b63a268..53c748ca 100644
--- a/test/testdatasheet.lua
+++ b/test/testdatasheet.lua
@@ -1,6 +1,6 @@
 local skynet = require "skynet"
-local builder = require "skynet.datasheet.builder"
-local datasheet = require "skynet.datasheet"
+
+local mode = ...
 
 local function dump(t, prefix)
 	for k,v in pairs(t) do
@@ -11,8 +11,26 @@ local function dump(t, prefix)
 	end
 end
 
+if mode == "child" then
+
+	local datasheet = require "skynet.datasheet"
+
+	skynet.start(function()
+		local t = datasheet.query("foobar")
+		dump(t, "[CHILD]")
+
+		skynet.sleep(100)
+		skynet.exit()
+	end)
+
+else
+
+local builder = require "skynet.datasheet.builder"
+local datasheet = require "skynet.datasheet"
+
 skynet.start(function()
 	builder.new("foobar", {a = 1, b = 2 , c = {3} })
+	skynet.newservice(SERVICE_NAME, "child")
 	local t = datasheet.query "foobar"
 	local c = t.c
 	dump(t, "[1]")
@@ -26,3 +44,5 @@ skynet.start(function()
 	skynet.sleep(100)
 	dump(t, "[3]")
 end)
+
+end
\ No newline at end of file