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From "Aleksey Yeschenko (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-7622) Implement virtual tables
Date Fri, 27 Apr 2018 15:00:00 GMT


Aleksey Yeschenko commented on CASSANDRA-7622:

bq. For instance, I do have a major high level concerns on the current patch in that I am
strongly in favor of not shipping syntax for creating virtual tables, at least for the initial
commit. I am completely sold on virtual tables as a mean to expose configuration infos and
metrics, but I'm a lot less sold about letting user create their own.

No disagreement here. We don't want it to be exposed in regular DDL. However, we would like
this to be at least a little bit generic, so that one could plug-in extra virtual keyspaces
on C* startup, similar to how some folks/forks add extra system keyspaces and system tables.
There are some use cases for virtual tables that we want to experiment with ([~jjirsa] gave
a few examples in his NGCC talk) that are compelling enough to at least allow this possibility.

> Implement virtual tables
> ------------------------
>                 Key: CASSANDRA-7622
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL
>            Reporter: Tupshin Harper
>            Assignee: Chris Lohfink
>            Priority: Major
>             Fix For: 4.x
>         Attachments: screenshot-1.png
> 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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