Blake Eggleston commented on CASSANDRA-14405:

link to PR: https://github.com/apache/cassandra/pull/224

> Transient Replication: Metadata refactor
> ----------------------------------------
>                 Key: CASSANDRA-14405
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14405
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Core, Distributed Metadata, Documentation and Website
>            Reporter: Ariel Weisberg
>            Assignee: Blake Eggleston
>            Priority: Major
>             Fix For: 4.0
> Add support to CQL and NTS for configuring keyspaces to have transient 
> replicas.
> Add syntax allowing a keyspace using NTS to declare some replicas in each DC 
> as transient.
> Implement metadata internal to the DB so that it's possible to identify what 
> replicas are transient for a given token or range.
> Introduce Replica which is an InetAddressAndPort and a boolean indicating 
> whether the replica is transient. ReplicatedRange which is a wrapper around a 
> Range that indicates if the range is transient.
> Block altering of keyspaces to use transient replication if they already 
> contain MVs or 2i.
> Block the creation of MV or 2i in keyspaces using transient replication.
> Block the creation/alteration of keyspaces using transient replication if the 
> experimental flag is not set.
> Update web site, CQL spec, and any other documentation for the new syntax.

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