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From "Ariel Weisberg (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-14405) Transient Replication: Metadata refactor
Date Tue, 17 Jul 2018 16:57:00 GMT


Ariel Weisberg commented on CASSANDRA-14405:

Blake was out for a while so I took over the metadata refactor. [This branch|]
is what we are using now and it's the base for  CASSANDRA-14406, CASSANDRA-14407, and CASSANDRA-14408
which we plan to merge to trunk together with the metadata refactor once complete. I don't
want to merge the metadata refactor alone since it's a bit silly if you can't even read and
write with transient replication.

The metadata refactor has been reviewed by @ifesdjeen and myself so far.

> Transient Replication: Metadata refactor
> ----------------------------------------
>                 Key: CASSANDRA-14405
>                 URL:
>             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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