接口默认返回100。修改接口线程池为1，不然数据库连接会断

src/service/recommend_service.py

@@ -18,7 +18,7 @@ recommender = UserCFRecommender(top_n=5, k=5)
 
 
 class RecommendHandler(tornado.web.RequestHandler):
-    executor = ThreadPoolExecutor(2)
+    executor = ThreadPoolExecutor(1)
 
     @tornado.gen.coroutine
     def get(self):
@@ -26,12 +26,12 @@ class RecommendHandler(tornado.web.RequestHandler):
         if uid is None:
             logger.warn('请求参数不正确，无uid')
 
-        size = self.get_argument('size', 10)
+        size = self.get_argument('size', 100)
         try:
             size = int(size)
         except Exception as e:
             logger.warn('size=%s 不是数字', size)
-            size = 10
+            size = 100
 
         ret = yield self.run(uid, size)
         self.write(ret)
@@ -41,7 +41,7 @@ class RecommendHandler(tornado.web.RequestHandler):
     def post(self):
         param = json.loads(self.request.body.decode('utf-8'))
         uid = param.get('uid', None)
-        size = param.get('size', 10)
+        size = param.get('size', 100)
         if uid is None:
             logger.warn('请求参数不正确，无uid')
 
@@ -50,7 +50,7 @@ class RecommendHandler(tornado.web.RequestHandler):
 
 
     @run_on_executor
-    def run(self, uid, size=10):
+    def run(self, uid, size=100):
         logger.info('request@@uid=%s@@size=%s', uid, size)
         try:
             recommend_result = recommender.recommend(uid, size=size, is_merge=True)