google-app-engine - Google App Engine python 2.7 中出现 "Release unlocked lock"错误，threadsafe=No

标签 google-app-engine python-2.7 python-multithreading

我在 Google App Engine (gqueues) 上的应用程序日志中偶尔会看到“释放未锁定的锁”错误，但无法找出原因(下面是完整的堆栈跟踪)。有谁知道为什么会发生这个错误？

有趣的是，该应用程序在 python 2.7 上运行，并且 threadsafe=NO，因此根本不会发生任何锁定或锁定错误，这似乎很奇怪。

背景故事:GQueues 运行在 python2.5 上，四月初我将其迁移到 2.7 并设置了 threadsafe=True。一周以来一切正常。然后在 4 月 9 日早上，整个应用程序无法访问，并出现 500 个错误。它不断生成延迟超过 30 秒的新服务器实例。我注意到在我的日志中看到错误“无法解锁已解锁的锁”。在迁移过程中，我没有向代码添加任何锁定机制，因此我认为这是错误所指的应用程序引擎的锁定。不管怎样，我将我的应用程序回滚到仍使用 Python 2.5 的先前版本，一切都重新开始工作。

4 月晚些时候，AppEngine Downtime Notify 透露，4 月 9 日他们的终端出现了一个问题，导致 python 2.7 应用程序出现问题。 https://groups.google.com/d/topic/google-appengine-downtime-notify/QL8TmRn6Ay4/discussion

我对来自 Google 的 Christina Ilvento 进行了跟进，她认为现在回到 Python 2.7 并设置 threadsafe=True 应该没问题。我迁移回 2.7，但保留了 threadsafe=False，认为我应该给它几个星期的时间，以确保一切在 2.7 上运行良好，然后再次打开线程(我认为这是导致问题的原因)。几周来一切都工作正常，但现在即使禁用了线程，我也看到了这个“释放未锁定的锁”错误。有谁知道这是怎么回事？

克里斯蒂娜建议我在这里发帖，App Engine 团队会跟进。

release unlocked lock
Traceback (most recent call last):
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 545, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/controllers/util.py", line 69, in check_login
    handler_method(self, *args)
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/controllers/main.py", line 297, in get
    self.generate('main.html', template_values)
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/controllers/baserequest.py", line 257, in generate
    self.response.out.write(template.render(path, values))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/webapp/template.py", line 92, in render
    return t.render(Context(template_dict))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/webapp/template.py", line 172, in wrap_render
    return orig_render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 173, in render
    return self._render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 167, in _render
    return self.nodelist.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 794, in render
    bits.append(self.render_node(node, context))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 807, in render_node
    return node.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/loader_tags.py", line 139, in render
    return self.template.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 173, in render
    return self._render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 167, in _render
    return self.nodelist.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 794, in render
    bits.append(self.render_node(node, context))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 807, in render_node
    return node.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/defaulttags.py", line 173, in render
    nodelist.append(node.render(context))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/defaulttags.py", line 257, in render
    return self.nodelist_true.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 794, in render
    bits.append(self.render_node(node, context))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 807, in render_node
    return node.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/loader_tags.py", line 139, in render
    return self.template.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 173, in render
    return self._render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 167, in _render
    return self.nodelist.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 794, in render
    bits.append(self.render_node(node, context))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 807, in render_node
    return node.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/loader_tags.py", line 139, in render
    return self.template.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 173, in render
    return self._render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 167, in _render
    return self.nodelist.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 794, in render
    bits.append(self.render_node(node, context))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 807, in render_node
    return node.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/defaulttags.py", line 173, in render
    nodelist.append(node.render(context))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/loader_tags.py", line 139, in render
    return self.template.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 173, in render
    return self._render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 167, in _render
    return self.nodelist.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 794, in render
    bits.append(self.render_node(node, context))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 807, in render_node
    return node.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/loader_tags.py", line 139, in render
    return self.template.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 173, in render
    return self._render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 167, in _render
    return self.nodelist.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 794, in render
    bits.append(self.render_node(node, context))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/__init__.py", line 807, in render_node
    return node.render(context)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/_internal/django/template/defaulttags.py", line 136, in render
    values = list(values)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 2312, in next
    return self.__model_class.from_entity(self.__iterator.next())
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/datastore/datastore_query.py", line 2809, in next
    next_batch = self.__batcher.next()
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/datastore/datastore_query.py", line 2671, in next
    return self.next_batch(self.AT_LEAST_ONE)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/datastore/datastore_query.py", line 2708, in next_batch
    batch = self.__next_batch.get_result()
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/api/apiproxy_stub_map.py", line 592, in get_result
    return self.__get_result_hook(self)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/datastore/datastore_query.py", line 2450, in __query_result_hook
    self._batch_shared.conn.check_rpc_success(rpc)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/datastore/datastore_rpc.py",

更新: 这是其中一个错误的完整回溯

46.231.181.199 - sandra.martin [15/May/2012:03:28:44 -0700] "POST /items/ HTTP/1.1" 500 1306 "http://www.gqueues.com/main?q=ag1zfmdxdWV1ZXMtaHJkciILEgdBY2NvdW50GL-psgYMCxILU2hhcmVkUXVldWUYkU4M";;;; "Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20100101 Firefox/12.0" "www.gqueues.com" ms=59858 cpu_ms=154948 api_cpu_ms=112433 cpm_usd=4.305925 instance=00c61b117cfbf1818fa4b0f779eacc7f4a9030
D 2012-05-15 05:27:45.121
postAction: reorder
E 2012-05-15 05:28:44.714
release unlocked lock
Traceback (most recent call last):
  File "/base/python27_runtime/python27_lib/versions/third_party/webapp2-2.3/webapp2.py", line 545, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/controllers/util.py", line 139, in check_login
    handler_method(self, *args)
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/controllers/items.py", line 371, in post
    self.reorder()
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/controllers/items.py", line 856, in reorder
    QueueSyncHandler.syncQueueViewers(clientId, itemQueue)
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/controllers/queuesync.py", line 197, in syncQueueViewers
    jsonObj['items']        = util.getJSONItems(queueItems, filter, queueViewer.type, accountObj)
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/controllers/util.py", line 1536, in getJSONItems
    jsonItem['subitems'] = getJSONItems(subItems, filter, type, accountObj, assignmentCompleted=assignmentCompleted, accountEmail=accountEmail)
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/controllers/util.py", line 1536, in getJSONItems
    jsonItem['subitems'] = getJSONItems(subItems, filter, type, accountObj, assignmentCompleted=assignmentCompleted, accountEmail=accountEmail)
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/controllers/util.py", line 1536, in getJSONItems
    jsonItem['subitems'] = getJSONItems(subItems, filter, type, accountObj, assignmentCompleted=assignmentCompleted, accountEmail=accountEmail)
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/controllers/util.py", line 1481, in getJSONItems
    if item.hasAssignments():
  File "/base/data/home/apps/s~gqueues-hrd/gq3-7-5.358902352474055782/models.py", line 1512, in hasAssignments
    itemAssignments = Assignment.all(keys_only=True).filter('item =', self).fetch(1)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/ext/db/__init__.py", line 2143, in fetch
    return list(self.run(limit=limit, offset=offset, **kwargs))
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/datastore/datastore_query.py", line 2809, in next
    next_batch = self.__batcher.next()
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/datastore/datastore_query.py", line 2671, in next
    return self.next_batch(self.AT_LEAST_ONE)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/datastore/datastore_query.py", line 2708, in next_batch
    batch = self.__next_batch.get_result()
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/api/apiproxy_stub_map.py", line 592, in get_result
    return self.__get_result_hook(self)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/datastore/datastore_query.py", line 2450, in __query_result_hook
    self._batch_shared.conn.check_rpc_success(rpc)
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/datastore/datastore_rpc.py", line 1206, in check_rpc_success
    rpc.wait()
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/api/apiproxy_stub_map.py", line 533, in wait
    self.__rpc.Wait()
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/api/apiproxy_rpc.py", line 119, in Wait
    rpc_completed = self._WaitImpl()
  File "/base/python27_runtime/python27_lib/versions/1/google/appengine/runtime/apiproxy.py", line 134, in _WaitImpl
    self.__done_event.wait()
  File "/base/python27_runtime/python27_dist/lib/python2.7/threading.py", line 407, in wait
    self.__cond.release()
error: release unlocked lock

最佳答案

感谢您的报告。我们(GAE python 团队)已经意识到这个错误。可能发生的情况是，您的处理程序可能已达到请求截止日期并遇到我们在 https://developers.google.com/appengine/docs/python/runtime#The_Request_Timer 中警告的问题。 .

您能为我检查几件事吗: 1. 异常跟踪似乎不完整。如果可能的话，您可以发布完整的回溯吗？ 2. 您能否检查(在日志中)遇到此问题的请求的请求时间并将其发布在此处。

编辑:我链接到的页面上的警告最近发布。

关于google-app-engine - Google App Engine python 2.7 中出现 "Release unlocked lock"错误，threadsafe=No，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10607337/

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