当我尝试使用文档（下面）中提供的相同示例写入blobstore时，它每次都在dev服务器上运行，但在appspot上100％失败并出现此错误：The API call file.Create() took too long to respond and was cancelled. Google搜索显示这是一个罕见的问题，尽管有些人报道过。知道这里发生了什么吗？
我在开发服务器上使用Python 2.6，这也许就是为什么我在开发期间没有看到这个。
from __future__ import with_statement
from google.appengine.api import files
# Create the file
file_name = files.blobstore.create(mime_type='application/octet-stream')
# Open the file and write to it
with files.open(file_name, 'a') as f:
f.write('data')
# Finalize the file. Do this before attempting to read it.
files.finalize(file_name)
# Get the file's blob key
blob_key = files.blobstore.get_blob_key(file_name)
回溯：
The API call file.Create() took too long to respond and was cancelled.
Traceback (most recent call last):
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 1516, in __call__
rv = self.handle_exception(request, response, e)
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 1510, in __call__
rv = self.router.dispatch(request, response)
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 1258, in default_dispatcher
return route.handler_adapter(request, response)
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 1082, in __call__
return handler.dispatch()
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 552, in dispatch
return self.handle_exception(e, self.app.debug)
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 550, in dispatch
return method(*args, **kwargs)
File "/base/data/home/apps/s~czongae/1.356669185377832769/main.py", line 43, in get
file_name = files.blobstore.create(mime_type='text/html')
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/files/blobstore.py", line 69, in create
return files._create(_BLOBSTORE_FILESYSTEM, params=params)
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/files/file.py", line 491, in _create
_make_call('Create', request, response)
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/files/file.py", line 234, in _make_call
rpc.check_success()
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/apiproxy_stub_map.py", line 558, in check_success
self.__rpc.CheckSuccess()
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/apiproxy_rpc.py", line 133, in CheckSuccess
raise self.exception
DeadlineExceededError: The API call file.Create() took too long to respond and was cancelled.
Saved; key: __appstats__:082400, part: 41 bytes, full: 5691 bytes, overhead: 0.000 + 0.004; link: http://czongae.appspot.com/_ah/stats/details?time=1328696282404
<class 'google.appengine.runtime.apiproxy_errors.DeadlineExceededError'>: The API call file.Create() took too long to respond and was cancelled.
Traceback (most recent call last):
File "/base/data/home/apps/s~czongae/1.356669185377832769/main.py", line 72, in <module>
main()
File "/base/data/home/apps/s~czongae/1.356669185377832769/main.py", line 69, in main
app.run()
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 1595, in run
_webapp_util.run_wsgi_app(self)
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/util.py", line 98, in run_wsgi_app
run_bare_wsgi_app(add_wsgi_middleware(application))
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/util.py", line 118, in run_bare_wsgi_app
for data in result:
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/appstats/recording.py", line 924, in appstats_wsgi_wrapper
result = app(environ, appstats_start_response)
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 1524, in __call__
response = self._internal_error(e)
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 1516, in __call__
rv = self.handle_exception(request, response, e)
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 1510, in __call__
rv = self.router.dispatch(request, response)
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 1258, in default_dispatcher
return route.handler_adapter(request, response)
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 1082, in __call__
return handler.dispatch()
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 552, in dispatch
return self.handle_exception(e, self.app.debug)
File "/base/data/home/apps/s~czongae/1.356669185377832769/webapp2.py", line 550, in dispatch
return method(*args, **kwargs)
File "/base/data/home/apps/s~czongae/1.356669185377832769/main.py", line 43, in get
file_name = files.blobstore.create(mime_type='text/html')
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/files/blobstore.py", line 69, in create
return files._create(_BLOBSTORE_FILESYSTEM, params=params)
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/files/file.py", line 491, in _create
_make_call('Create', request, response)
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/files/file.py", line 234, in _make_call
rpc.check_success()
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/apiproxy_stub_map.py", line 558, in check_success
self.__rpc.CheckSuccess()
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/apiproxy_rpc.py", line 133, in CheckSuccess
raise self.exception
答案 0 :(得分：1)
官方手册中没有记录。但是在打开文件时尝试添加exclusive_lock=True。在我的blobstore从M / S迁移到HRD期间，我认为我遇到了这个问题。
# Open the file and write to it
with files.open(file_name, 'a', exclusive_lock=True) as f:
f.write('data')