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https://issues.apache.org/jira/browse/HADOOP-3062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620791#action_12620791
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Chris Douglas commented on HADOOP-3062:
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bq. Is there any information logged about [breakdown by racks]?
No, that's handled in the analysis. I don't think the datanodes or the reduce
tasks know about topology, anyway.
> Need to capture the metrics for the network ios generate by dfs reads/writes
> and map/reduce shuffling and break them down by racks
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-3062
> URL: https://issues.apache.org/jira/browse/HADOOP-3062
> Project: Hadoop Core
> Issue Type: Improvement
> Components: metrics
> Reporter: Runping Qi
> Fix For: 0.19.0
>
> Attachments: 3062-0.patch
>
>
> In order to better understand the relationship between hadoop performance and
> the network bandwidth, we need to know
> what the aggregated traffic data in a cluster and its breakdown by racks.
> With these data, we can determine whether the network
> bandwidth is the bottleneck when certain jobs are running on a cluster.
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