diff --git a/Dockerfile b/Dockerfile
index 3854b65ca..b1835a7e0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,7 +17,7 @@ ADD ./ /opt/pyspider
 WORKDIR /opt/pyspider
 RUN IGNORE_MYSQL=1 IGNORE_RABBITMQ=1 IGNORE_MONGODB=1 ./runtest.py
 
-VOLUME ["/opt/pyspider/data"]
+VOLUME ["/opt/pyspider"]
 
 ENTRYPOINT ["python", "run.py"]
 
diff --git a/fetcher/phantomjs_fetcher.js b/fetcher/phantomjs_fetcher.js
index 369ed3e93..5f8d4ce35 100644
--- a/fetcher/phantomjs_fetcher.js
+++ b/fetcher/phantomjs_fetcher.js
@@ -16,7 +16,9 @@ if (system.args.length !== 2) {
   port = system.args[1];
   server = require('webserver').create();
 
-  service = server.listen(port, function (request, response) {
+  service = server.listen(port, {
+    'keepAlive': true
+  }, function (request, response) {
     //console.log(JSON.stringify(request, null, 4));
     // check method
     if (request.method == 'GET') {
@@ -46,6 +48,7 @@ if (system.args.length !== 2) {
     
     // add callbacks
     var first_response = null,
+        finished = false,
         page_loaded = false,
         start_time = Date.now(),
         end_time = null;
@@ -98,14 +101,13 @@ if (system.args.length !== 2) {
 
     // make response
     function make_result(page) {
-      if (!!!end_time) {
+      if (!!!end_time || finished) {
         return;
       }
       if (end_time > Date.now()) {
         setTimeout(make_result, Date.now() - end_time, page);
         return;
       }
-      end_time = null;
 
       var cookies = {};
       page.cookies.forEach(function(e) {
@@ -119,19 +121,25 @@ if (system.args.length !== 2) {
         status_code: first_response.status || 599,
         url: page.url,
         cookies: cookies,
-        time: (end_time - start_time) / 1000,
+        time: (Date.now() - start_time) / 1000,
         save: fetch.save
       }
       console.log("["+result.status_code+"] "+result.orig_url+" "+result.time)
 
-      var body = JSON.stringify(result, null, 2);
+      var body = unescape(encodeURIComponent(JSON.stringify(result, null, 2)));
       response.statusCode = 200;
       response.headers = {
         'Cache': 'no-cache',
         'Content-Type': 'application/json',
+        'Connection': 'Keep-Alive',
+        'Keep-Alive': 'timeout=5, max=100',
+        'Content-Length': body.length
       };
+      response.setEncoding("binary");
       response.write(body);
-      response.closeGracefully();
+      response.close();
+      finished = true;
+      page.close();
     }
   });
 
diff --git a/fetcher/tornado_fetcher.py b/fetcher/tornado_fetcher.py
index f865d45a2..2a9a9ab0c 100644
--- a/fetcher/tornado_fetcher.py
+++ b/fetcher/tornado_fetcher.py
@@ -293,7 +293,7 @@ def handle_response(response):
                         }
             else:
                 try:
-                    return task, json.loads(response.body)
+                    result = json.loads(response.body)
                 except Exception as e:
                     result = {
                             'status_code': 599,
@@ -302,8 +302,11 @@ def handle_response(response):
                             'orig_url': url,
                             'url': url,
                             }
-            logger.exception("[599] %s, %r %.2fs",
-                    url, result['content'], result['time'])
+            if result.get('status_code', 200):
+                logger.info("[%d] %s %.2fs", result['status_code'], url, result['time'])
+            else:
+                logger.exception("[%d] %s, %r %.2fs", result['status_code'],
+                        url, result['content'], result['time'])
             callback('phantomjs', task, result)
             self.on_result('phantomjs', task, result)
             return task, result
diff --git a/scheduler/scheduler.py b/scheduler/scheduler.py
index 30cf10f92..a1abbdaaf 100644
--- a/scheduler/scheduler.py
+++ b/scheduler/scheduler.py
@@ -188,6 +188,7 @@ def _check_task_done(self):
     def _check_request(self):
         cnt = 0
         try:
+            processed_task_cache = set()
             while cnt < self.LOOP_LIMIT:
                 task = self.newtask_queue.get_nowait()
                 if not self.task_verify(task):
@@ -206,12 +207,18 @@ def _check_request(self):
                     if not task.get('schedule', {}).get('force_update', False):
                         logger.debug('ignore newtask %(project)s:%(taskid)s %(url)s', task)
                         continue
+                cache_key = "%(project)s:%(project)s" % task
+                if cache_key in processed_task_cache:
+                    logger.debug('processed newtask %(project)s:%(taskid)s %(url)s', task)
+                    continue
+
                 oldtask = self.taskdb.get_task(task['project'], task['taskid'],
                         fields=self.merge_task_fields)
                 if oldtask:
                     task = self.on_old_request(task, oldtask)
                 else:
                     task = self.on_new_request(task)
+                processed_task_cache.add(cache_key)
                 cnt += 1
         except Queue.Empty:
             pass
diff --git a/webui/debug.py b/webui/debug.py
index e0d2a0dd2..c1349fde0 100644
--- a/webui/debug.py
+++ b/webui/debug.py
@@ -49,7 +49,7 @@ def debug(project):
     taskid = request.args.get('taskid')
     if taskid:
         taskdb = app.config['taskdb']
-        task = taskdb.get_task(project, taskid, ['taskid', 'project', 'url', 'process'])
+        task = taskdb.get_task(project, taskid, ['taskid', 'project', 'url', 'fetch', 'process'])
     else:
         task = default_task