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https://issues.apache.org/jira/browse/CASSANDRA-21179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yifan Cai updated CASSANDRA-21179:
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Reviewers: Yifan Cai
Status: Review In Progress (was: Needs Committer)
> Introduce a check for minimum time passed before importing / training of a
> compression dictionary is allowed
> ------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-21179
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21179
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Feature/Compression
> Reporter: Stefan Miklosovic
> Assignee: Stefan Miklosovic
> Priority: Normal
> Fix For: 5.x
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> After CASSANDRA-21178 where we introduced created_at column to dict table, we
> can move forward with the check which ensures that a user is not
> over-training, or they can not train / import at all.
> 1) by default, there would be a minimum time between training / importing is
> enabled
> 2) Default would be, for example, 1 hour, and it would be configurable
> 3) The configuration would be done CQL level in compression parameters, that
> way all nodes would see same values due to TCM schema propagation, so this
> can not be attacked by "round-robin" training, node by node
> 4) If we want to disable training / importing completely, we would set
> minimum training frequency to "0" (0h, 0s ...). This means that if we want to
> allow training again, an operator would need to raise this value, then the
> last training would still need to occur at least so and so time back to be
> able to train again.
> It would be better if "no training allowed" is represented by high value,
> like 100 years, (36500 days) instead of 0. Setting it to 0 seems like an
> exception / corner case which is not intuitive to follow, as one would say
> that 0 means that we can train whenever we want. 0 should be the default. Not
> 1 hour.
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