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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-1379) Uncached row reads may block cached reads
Date Sat, 17 Nov 2012 12:59:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499403#comment-13499403
] 

Jonathan Ellis commented on CASSANDRA-1379:
-------------------------------------------

With each Stage costing us 0.1 to 0.2 ms, it doesn't seem worth adding extra latency to all
requests for a relatively rare case.  Maybe if we solve the latency problem we can revisit
this.
                
> 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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