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我需要讀取表中的所有行(超過一百萬)。我已閱讀關於分頁(http://www.datastax.com/dev/blog/datastax-python-driver-2-0-released) - 沒有多大幫助。 的代碼相當直截了當:Python 2.6 Cassandra 2.0.1 ReadTimeout
...
retry = RetryPolicy()
retry.RETRY = 10
cluster = Cluster(
[ ... ],
reconnection_policy=ConstantReconnectionPolicy(5.0, 100),
auth_provider=auth_provider,
load_balancing_policy=RoundRobinPolicy(),
default_retry_policy=retry,
port=9042)
session = cluster.connect("test")
session.default_timeout = 9999
session.default_fetch_size = 1000
...
...
uname_stmt = SimpleStatement(q, fetch_size=100)
uname_stmt.consistency_level = ConsistencyLevel.ONE
for row in session.execute(uname_stmt):
...
基本上後約5分鐘左右(可以是1分鐘或者它可以是10)的最後一個for循環觸發此錯誤:
Traceback (most recent call last):
File "test.py", line 67, in <module>
for row in session.execute(uname_stmt):
File "/usr/lib/python2.6/site-packages/cassandra/cluster.py", line 2939, in next
result = self.response_future.result(self.timeout)
File "/usr/lib/python2.6/site-packages/cassandra/cluster.py", line 2771, in result
raise self._final_exception
cassandra.ReadTimeout: code=1200 [Coordinator node timed out waiting for replica nodes' responses] message="Operation timed out - received only 0 responses." info={'received_responses': 0, 'data_retrieved': False, 'required_responses': 1, 'consistency': 1}
任何幫助會很棒! 謝謝!
感謝您的回覆,我已經試過了,沒有幫助:( 我還安裝了最新的卡桑德拉 - 同樣的問題。 – Pavel 2014-11-03 15:55:51