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From "Kevin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5031) metrics aggregation is incorrect in database
Date Fri, 06 Mar 2009 18:07:56 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12679672#action_12679672
] 

Kevin commented on HADOOP-5031:
-------------------------------

+1 minor change. it's actually in prod already.

> 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
>         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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