why this happens?

a model has 100,000+ entries in it.
q=Foo.all()
e=q.get()

error occurs:

  File "/base/python_lib/versions/1/google/appengine/ext/db/
__init__.py", line 1346, in get
    results = self.fetch(1)
  File "/base/python_lib/versions/1/google/appengine/ext/db/
__init__.py", line 1390, in fetch
    raw = self._get_query().Get(limit, offset)
  File "/base/python_lib/versions/1/google/appengine/api/datastore.py"
, line 942, in Get
    return self._Run(limit, offset)._Next(limit)
  File "/base/python_lib/versions/1/google/appengine/api/datastore.py"
, line 886, in _Run
    _ToDatastoreError(err)
  File "/base/python_lib/versions/1/google/appengine/api/datastore.py"
, line 1965, in _ToDatastoreError
    raise errors[err.application_error](err.error_detail)
Timeout
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