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From "Vijay (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-5255) dsnitch severity is not correctly set for compaction info
Date Mon, 18 Feb 2013 06:45:20 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-5255?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vijay updated CASSANDRA-5255:
-----------------------------

    Attachment: 0001-Cassandra-5255.patch

Attached patch fixes the negative severity.

{quote}
 we should report based on how much IO we're using, since a 1T throttled to 5MB/s is less
impactful than a 100MB running at full speed
{quote}

Well I am not sure about that, 100MB without throttle may be on SSD's and 1TB may be on Spindles....
So looking at the throttle might not help and we should assume the user did the right thing
on throttle.

Another possible option: Create a way to get IOStat data into the JVM and measure the IOWait
time but the problem is how do we support MS Windows? not sure if there is a generic way to
do so.

I would suggest we do both Streaming and IOWait monitor in another ticket, Makes sense?
                
> dsnitch severity is not correctly set for compaction info
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-5255
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5255
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.2.0 beta 1
>            Reporter: Brandon Williams
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 1.2.2
>
>         Attachments: 0001-Cassandra-5255.patch
>
>
> We're doing two things wrong in CI.  First, load can change between calls, which can
cause a negative severity even though it meant to subtract whatever it added before.  Second,
we should report based on how much IO we're using, since a 1T throttled to 5MB/s is less impactful
than a 100MB running at full speed.

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