[jira] [Commented] (CASSANDRA-21178) Introduce created_at column to system_distributed.compression_dictionaries

["Stefan Miklosovic (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-21178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18059212#comment-18059212 ] 

Stefan Miklosovic commented on CASSANDRA-21178:
-----------------------------------------------

https://pre-ci.cassandra.apache.org/job/cassandra/401/#showFailuresLink

> Introduce created_at column to system_distributed.compression_dictionaries
> --------------------------------------------------------------------------
>
>                 Key: CASSANDRA-21178
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-21178
>             Project: Apache Cassandra
>          Issue Type: Task
>          Components: Feature/Compression
>            Reporter: Stefan Miklosovic
>            Assignee: Stefan Miklosovic
>            Priority: Normal
>             Fix For: 5.x
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Rationale:
> 1) A user does not know when a training occurred so they can not evaluate if they shoul train again.
> 2) A user could implement "poor's man auto training" just by croning it. 
> 3) At the same time, we do not want to "over train", that is, we do not want to allow a user to train, for example, 100 times per minute as that does not make any sense. If we introduce created_at column with a timestamp, then we could say that not enough time elapsed since the last training and such operation would be failed.



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