What happens If one node has outdated version of schema, and it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?
>
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