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From "Jim Witschey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10585) SSTablesPerReadHistogram seems wrong when row cache hit happend
Date Fri, 06 Nov 2015 20:41:10 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14994397#comment-14994397
] 

Jim Witschey commented on CASSANDRA-10585:
------------------------------------------

[~benedict] or [~Stefania], is one of you the right person to have a look at this?

> SSTablesPerReadHistogram seems wrong when row cache hit happend
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-10585
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10585
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Ivan Burmistrov
>            Priority: Minor
>             Fix For: 2.1.x
>
>         Attachments: cassandra-10585.patch
>
>
> SSTablePerReadHistogram metric now not considers case when row has been read from row
cache.
> And so, this metric will have big values even almost all requests processed by row cache
(and without touching SSTables, of course).
> So, it seems that correct behavior is to consider that if we read row from row cache
then we read zero SSTables by this request.
> The patch at the attachment.



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