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Date: Fri, 13 Mar 2009 08:05:52 -0700 (PDT)
From: "Hudson (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5031) metrics aggregation is incorrect in
 database
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    [ https://issues.apache.org/jira/browse/HADOOP-5031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681738#action_12681738 ] 

Hudson commented on HADOOP-5031:
--------------------------------

Integrated in Hadoop-trunk #778 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/778/])
    

> metrics aggregation is incorrect in database
> --------------------------------------------
>
>                 Key: HADOOP-5031
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5031
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/chukwa
>         Environment: Redhat 5.1, Java 6
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-5031.patch
>
>
> A few problem with the aggregation SQL statements:
> hdfs throughput should be calculated by doing two level aggregation:
> First, calculate the rate for hadoop datanode metrics with accumulated vales.
> Second, sum up all datanode rate to provide a single number to represent the current cluster performance.
> Disable hod jobs utilization measurement - The data provide a rough view of the cluster performance but mostly inaccurate.
> Disable user utilization measurement generated from hod job - The data is generated from hod job metrics, and it's mostly inaccurate.

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