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From "Vijay (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5306) Improve Dsnitch Severity
Date Mon, 25 Mar 2013 20:25:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13613073#comment-13613073
] 

Vijay commented on CASSANDRA-5306:
----------------------------------

{quote}
Still need to switch compaction info to throughput instead of load / size.
{quote}

Are we talking about (user defined throttle / compacting file sizes)? if yes then we will
be penalizing instances which can do more on disk...
IMHO: the bigger the compaction bigger the file cache misses and more memory pressure, hence
we added the size/load in the first place.
                
> Improve Dsnitch Severity
> ------------------------
>
>                 Key: CASSANDRA-5306
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5306
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 1.2.4
>
>         Attachments: 0001-5306.patch
>
>
> This ticket is to continue the discussion in CASSANDRA-5255.
> Currently Dsnitch reports the Severity by calculating the amount of data compacting relative
to load of the node. 
> It will be nice to report Severity as a factor of load average, N/W Throughput and IO
Wait instead.
> http://www.hyperic.com/products/sigar seem to have it (But personally i have not used
it).

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