column-family

来源： https://stackoverflow.com/questions/23548211/how-to-copy-cassandra-data-from-one-cluster-to-another

来源： https://stackoverflow.com/questions/23548211/how-to-copy-cassandra-data-from-one-cluster-to-another

问题 I am new to cassandra and I read some articles about static and dynamic column family. It is mentioned ,From Cassandra 3 table and column family are same. I created key space, some tables and inserted data into that table. CREATE TABLE subscribers( id uuid, email text, first_name text, last_name text, PRIMARY KEY(id,email) ); INSERT INTO subscribers(id,email,first_name,last_name) VALUES(now(),'Test@123.com','Test1','User1'); INSERT INTO subscribers(id,email,first_name,last_name) VALUES(now(),

问题 In Cassandra Wiki, it is said that there is a limit of 2 billion cells (rows x columns) per partition. But it is unclear to me what is a partition? Do we have one partition per node per column family, which would mean that the max size of a column family would be 2 billion cells * number of nodes in the cluster. Or will Cassandra create as much partitions as required to store all the data of a column family? I am starting a new project so I will use Cassandra 2.0. 回答1: With the advent of CQL3

问题 In Cassandra Wiki, it is said that there is a limit of 2 billion cells (rows x columns) per partition. But it is unclear to me what is a partition? Do we have one partition per node per column family, which would mean that the max size of a column family would be 2 billion cells * number of nodes in the cluster. Or will Cassandra create as much partitions as required to store all the data of a column family? I am starting a new project so I will use Cassandra 2.0. 回答1: With the advent of CQL3

问题 In Cassandra Wiki, it is said that there is a limit of 2 billion cells (rows x columns) per partition. But it is unclear to me what is a partition? Do we have one partition per node per column family, which would mean that the max size of a column family would be 2 billion cells * number of nodes in the cluster. Or will Cassandra create as much partitions as required to store all the data of a column family? I am starting a new project so I will use Cassandra 2.0. 回答1: With the advent of CQL3

问题 In Cassandra Wiki, it is said that there is a limit of 2 billion cells (rows x columns) per partition. But it is unclear to me what is a partition? Do we have one partition per node per column family, which would mean that the max size of a column family would be 2 billion cells * number of nodes in the cluster. Or will Cassandra create as much partitions as required to store all the data of a column family? I am starting a new project so I will use Cassandra 2.0. 回答1: With the advent of CQL3

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 25 days ago . I feel very difficult to understand the concept of wide row and related concepts from Cassandra The Definite Guide : Cassandra uses a special primary key called a composite key (or compound key) to represent wide rows, also called partitions . The composite key consists of a

问题 I'm using the cassandra python driver for datastax's distro. mah codez... from cassandra.io.libevreactor import LibevConnection from cassandra.cluster import Cluster cluster = Cluster(['some ip addr']) cluster.connection_class = LibevConnection fails: session = cluster.connect('demodb') session.execute("INSERT INTO colFamName(attr1, attr2) VALUES ('123jkd', 'sdflkj')") session.execute("SELECT attr1 FROM colFamName") passes: session = cluster.connect('demodb') session.execute("INSERT INTO

问题 I am using cassandra 2.0.6. and have this table: CREATE TABLE t ( id text, idx bigint, data bigint, PRIMARY KEY (id, idx) ) So say I got these rows: id / idx / data x 1 data1 x 2 data2 x 3 data3 .... goes on say 1000 rows for x If I query : select * from t where id='x' order by idx limit 1 Will cassandra fetch all the 1000 rows , or only a small part of it? Reading articles like http://www.ebaytechblog.com/2012/08/14/cassandra-data-modeling-best-practices-part-2/#.UzrvLKZx2PI , it seems it