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https://issues.apache.org/jira/browse/CASSANDRA-1379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13073421#comment-13073421
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Jonathan Ellis commented on CASSANDRA-1379:
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Oh, right, you created this ticket. :) So, we do have at least one use case.
> Uncached row reads may block cached reads
> -----------------------------------------
>
> Key: CASSANDRA-1379
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1379
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: David King
> Assignee: Javier Canillas
> Priority: Minor
> Attachments: CASSANDRA-1379.patch
>
>
> The cap on the number of concurrent reads appears to cap the *total* number
> of concurrent reads instead of just capping the reads that are bound for
> disk. That is, given N concurrent readers if all of them are busy waiting on
> disk, even reads that can be served from the row cache will block waiting for
> them.
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