distributed-database

Is there a command or any way at all to know what data is stored on what nodes of Cassandra? Im pretty new to Cassandra and haven't had much luck googling this question. Thanks! You can get Cassandra to tell you which node(s) a particular key is on with nodetool getendpoints . $ nodetool getendpoints mykeyspace tbl '8546200' 192.168.73.188 192.168.73.190 I don't know if that's what you're looking for or not. AFAIK there isn't a way to flat-out query the responsible nodes for all rows in a table or keyspace. But as Blake pointed out, your application doesn't really need to worry about that. If

NoSQL refers to non-relational data stores that break with the history of relational databases and ACID guarantees. Popular open source NoSQL data stores include: Cassandra (tabular, written in Java, used by Cisco, WebEx, Digg, Facebook, IBM, Mahalo, Rackspace, Reddit and Twitter) CouchDB (document, written in Erlang, used by BBC and Engine Yard) Dynomite (key-value, written in Erlang, used by Powerset) HBase (key-value, written in Java, used by Bing) Hypertable (tabular, written in C++, used by Baidu) Kai (key-value, written in Erlang) MemcacheDB (key-value, written in C, used by Reddit)