Rahul, none of that is true at all.
Each node stores schema locally in a non-replicated system table. Schema changes are disseminated directly to live nodes (not the write path), and the schema version is gossiped to other nodes. If a node misses a schema update, it will figure this out when it notices that it’s local schema version is behind the one being gossiped by the rest of the cluster, and will pull the updated schema from the other nodes in the cluster. From: Rahul Singh <rahul.xavier.si...@gmail.com> Reply-To: <user@cassandra.apache.org> Date: Tuesday, April 17, 2018 at 4:13 PM To: <user@cassandra.apache.org> Subject: Re: where does c* store the schema? It uses a “everywhere” replication strategy and its recommended to do all alter / create / drop statements with consistency level all — meaning it wouldn’t make the change to the schema if the nodes are up. -- Rahul Singh rahul.si...@anant.us Anant Corporation On Apr 17, 2018, 12:31 AM -0500, Jinhua Luo <luajit...@gmail.com>, wrote: Yes, I know it must be in system schema. But how c* replicates the user defined schema to all nodes? If it applies the same RWN model to them, then what's the R and W? And when a failed node comes back to the cluster, how to recover the schema updates it may miss during the outage? 2018-04-16 17:01 GMT+08:00 DuyHai Doan <doanduy...@gmail.com>: There is a system_schema keyspace to store all the schema information https://docs.datastax.com/en/cql/3.3/cql/cql_using/useQuerySystem.html#useQuerySystem__table_bhg_1bw_4v On Mon, Apr 16, 2018 at 10:48 AM, Jinhua Luo <luajit...@gmail.com> wrote: Hi All, Does c* use predefined keyspace/tables to store the user defined schema? If so, what's the RWN of those meta schema? And what's the procedure to update them? --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org
