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https://issues.apache.org/jira/browse/CASSANDRA-21478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18136933#comment-18136933
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Caleb Rackliffe commented on CASSANDRA-21478:
---------------------------------------------

Dropped a few comments in the PR. Let me know what you think...

When we're both happy with any potential changes, I can fire up a CI run.

The only other question I have, which I've posted in ASF slack, is whether we 
can get this into 6.0.

> Add a new guardrail around the number of SSTables per read
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-21478
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-21478
>             Project: Apache Cassandra
>          Issue Type: Improvement
>          Components: Feature/Guardrails
>            Reporter: Caleb Rackliffe
>            Assignee: Shlomit
>            Priority: Normal
>             Fix For: 7.x
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> While there is some prior art on this for SAI, which warns and then fails 
> queries that touch too many SSTable indexes, the normal non-index read path 
> does not have any guardrail for extremely aberrant cases where perhaps 
> compaction falls behind and a small percentage of reads touch hundreds of 
> SSTables. It might be nice for the server to be louder about this.



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