[jira] Commented: (CASSANDRA-1379) Uncached row reads may block cached reads

["David King (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-1379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897430#action_12897430 ] 

David King commented on CASSANDRA-1379:
---------------------------------------

Not being familiar with the implementation I'm not sure I'm suggesting anything, but that sounds sane. Or checking the cache first in the stage previous

> 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
>            Priority: Minor
>             Fix For: 0.7.1
>
>
> 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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