[jira] [Commented] (CASSANDRA-7622) Implement virtual tables

["Robert Stupp (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-7622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14074602#comment-14074602 ] 

Robert Stupp commented on CASSANDRA-7622:
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So there would be two kinds of "vTables"? One that is consistent over all nodes (e.g. cluster status) and one that has node-dependent values (e.g. configuration per node)? I'm not against this one (it's great to have vTables) - but for example querying information from all nodes could be very expensive large clusters (1000 nodes) - the coordinater would have to query all 1000 cluster nodes. I guess that [~hayato.shimizu] had something like {{SELECT DISTINCT seed_nodes FROM node_config}} in mind to find configuration mistakes.

> Implement virtual tables
> ------------------------
>
>                 Key: CASSANDRA-7622
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7622
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Tupshin Harper
>             Fix For: 3.0
>
>
> There are a variety of reasons to want virtual tables, which would be any table that would be backed by an API, rather than data explicitly managed and stored as sstables.
> One possible use case would be to expose JMX data through CQL as a resurrection of CASSANDRA-3527.
> Another is a more general framework to implement the ability to expose yaml configuration information. So it would be an alternate approach to CASSANDRA-7370.
> A possible implementation would be in terms of CASSANDRA-7443, but I am not presupposing.



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