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https://issues.apache.org/jira/browse/CASSANDRA-15032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17068785#comment-17068785
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Alan Boudreault commented on CASSANDRA-15032:
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That was a good idea. Datastax drivers are currently adding the parsing fix so
this might not be required anymore.
> Adjust transient replication keyspace replication options to be more friendly
> to naive clients
> ----------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-15032
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15032
> Project: Cassandra
> Issue Type: Improvement
> Components: Feature/Transient Replication
> Reporter: Andy Tolbert
> Priority: Normal
>
> To specify the number of transient replicas, replication options are
> specified like:
> {code}
> ALTER KEYSPACE foo WITH REPLICATION = {'class' : 'NetworkTopologyStrategy',
> 'DC1' : '3/1'};
> ALTER KEYSPACE foo WITH REPLICATION = {'class' : 'SimpleStrategy',
> 'replication_factor' : '3/1'}
> {code}
> It occurred to me that existing client drivers that parse keyspace options
> may not handle this gracefully.
> For example, the datastax java driver tries to parse {{3/1}} as a number and
> fails. In this case, the parsing error is not fatal, its just that the
> metadata for that keyspace in the driver is incomplete, and things like token
> aware routing can't be utilized.
> It is possible that other libraries may not handle this as well.
> As an alternative, I propose adding a separate option like:
> {{'transient_replicas': 1}}. {{replication_factor}} would represent the
> total number of replicas (full and transient) in this case. Something similar
> could be done for the NTS case, but might be slightly clumsy to express.
> This would allow existing client libraries to continue working, and while
> things like routing may be suboptimal (i.e. driver won't know to
> differentiate between replicas and transient replicas), at least parsing
> won't fail in possibly fatal ways.
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