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Date: Wed, 25 Feb 2009 18:03:06 -0800 (PST)
From: "Ari Rabkin (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5051) hdfs throughput calculation is
 incorrect in chukwa database
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    [ https://issues.apache.org/jira/browse/HADOOP-5051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12676848#action_12676848 ] 

Ari Rabkin commented on HADOOP-5051:
------------------------------------

I don't feel qualified to review this; my SQL experience is quite limited. 
Is there a way to reduce the line lengths in aggregator.sql?

> hdfs throughput calculation is incorrect in chukwa database
> -----------------------------------------------------------
>
>                 Key: HADOOP-5051
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5051
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/chukwa
>         Environment: Redhat 5.1, Java 6
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>         Attachments: HADOOP-5051-1.patch
>
>
> The SQL statement to calculate hdfs throughput is incorrect.  The correct algorithm is to calculate metrics rate for individual datanode then sum up of all datanode's rate to get the total throughput for the cluster.

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