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我试图用cqlsh(cqlsh 5.0.1 | Cassandra 2.1.12 | CQL spec 3.2.1 | Native protocol v3
)奇怪的行为,同时从卡桑德拉读取数据的ColumnFamily
查询上做圆柱家族以下查询:
select * from CassandraColumnFamily limit 10
但它提供了以下错误
错误:
ReadTimeout: code=1200 [Coordinator node timed out waiting for replica nodes' responses] message="Operation timed out - received only 0 responses." info={'received_responses': 0, 'required_responses': 1, 'consistency': 'ONE'}
因为我能够使用下面的python脚本读取数据。我无法弄清楚这里可能是什么问题。
cluster = Cluster(
contact_points = ['IP1','IP2','IP3']
)
session = cluster.connect('cw')
query = "select col1 , col2, col3, col4, col5 from CassandraColumnFamily"
statement = SimpleStatement(query, fetch_size=50000)