What happens If one node has outdated version of schema, and it launches a write request upon that schema to other nodes as a coordinator? The received nodes would reject the coordinator?
2018-04-18 8:12 GMT+08:00 Blake Eggleston <beggles...@apple.com>: > 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 --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org
