交易影響如何讀取下一個非祖先查詢一致性NDB

Question

的apply phase of save may fail和/或仍然是正在做異步明年之前不強一致性讀取 - 非祖先查詢。

基於local testing文章中，我寫了一個測試應該模擬不一致寫着：

import dev_appserver 

dev_appserver.fix_sys_path() 

import unittest 
from google.appengine.ext import ndb 
from google.appengine.ext import testbed 
from google.appengine.datastore import datastore_stub_util 

class SomeModel(ndb.Model): 
    pass 

class SingleEntityConsistency(unittest.TestCase): 
    def setUp(self): 
     # Setup AppEngine env 
     self.testbed = testbed.Testbed() 
     self.testbed.activate() 
     self.policy = datastore_stub_util.PseudoRandomHRConsistencyPolicy(probability=0) 
     self.testbed.init_datastore_v3_stub(consistency_policy=self.policy) 
     self.testbed.init_memcache_stub() 
     # A test key 
     self.key = ndb.Key('SomeModel', 'test') 

    def tearDown(self): 
     self.testbed.deactivate() 

    def test_tx_get_or_insert(self): 
     p = SomeModel.get_or_insert('test') 
     self.assertEqual(0, SomeModel.query().count(1), "Shouldn't be applied yet") 
     self.assertEqual(1, SomeModel.query(ancestor=self.key).count(1), "Ancestor query read should be consistent") 

    def test_no_tx_insert(self): 
     p = SomeModel(id='test') 
     p.put() 
     self.assertEqual(0, SomeModel.query().count(2), "Shouldn't be applied yet") 
     self.assertEqual(1, SomeModel.query(ancestor=self.key).count(1), "Ancestor query read should be consistent") 

    def test_with_ancestor(self): 
     p = SomeModel(id='test') 
     p.put() 
     self.assertEqual(p, SomeModel.query(ancestor=self.key).get()) 

    def test_key(self): 
     p = SomeModel(id='test') 
     p.put() 
     self.assertEqual(p, self.key.get()) 

if __name__ == '__main__': 
    unittest.main() 

實際問題...

1. 是否包裹在開頭所述交易改變行爲put()？我還需要一個強烈一致的查詢作出肯定，我會讀是寫在TXN？ （測試表明，我仍然需要強烈一致的查詢）

2. 是key.get()認爲是強一致？ （測試表明，它是）

UPDATE

我已經更新了測試代碼圭多提到，現在所有的測試合格：

self.testbed.init_datastore_v3_stub(consistency_policy=self.policy) 

Answer 1

我相信你必須做一些事情來激活該政策。這將解釋測試失敗。此外，我相信只有查詢受到影響，並且唯一的投放是有效的交易。最後要提防NDB的緩存。