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