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From "Jon Haddad (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-7622) Implement virtual tables
Date Thu, 26 Apr 2018 19:23:02 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16454730#comment-16454730
] 

Jon Haddad edited comment on CASSANDRA-7622 at 4/26/18 7:22 PM:
----------------------------------------------------------------

For what it's worth, I wrote an internal TLP tool that takes every JMX metric and stores it
in a sqlite DB, and I'm doing it virtually the same way [~cnlwsu] has listed above.  Yes,
it requires grabbing the key you want up front, but as [~cnlwsu] notes, in every practical
use of these tables so does the alternative proposed by [~blerer].  

Assuming there's a trivial way to grab all the possible metrics that can be used from a different
view, it makes sense to me to expose the metrics in the way [~cnlwsu] has, so I'm in favor
of his approach as an operator.


was (Author: rustyrazorblade):
For what it's worth, I wrote an internal TLP tool that takes every JMX metric and stores it
in a sqlite DB, and I'm doing it the same with [~cnlwsu] has listed above.  Yes, it requires
grabbing the key you want up front, but as [~cnlwsu] notes, in every practical use of these
tables so does the alternative proposed by [~blerer].  

Assuming there's a trivial way to grab all the possible metrics that can be used from a different
view, it makes sense to me to expose the metrics in the way [~cnlwsu] has, so I'm in favor
of his approach as an operator.

> Implement virtual tables
> ------------------------
>
>                 Key: CASSANDRA-7622
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7622
>             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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