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https://issues.apache.org/jira/browse/HDFS-97?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved HDFS-97.
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Resolution: Duplicate
Basically a dupe.
> DFS should detect slow links(nodes) and avoid them
> --------------------------------------------------
>
> Key: HDFS-97
> URL: https://issues.apache.org/jira/browse/HDFS-97
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Runping Qi
>
> The current DFS does not detect slow links (nodes).
> Thus, when a node or its network link is slow, it may affect the overall
> system performance significantly.
> Specifically, when a map job needs to read data from such a node, it may
> progress 10X slower.
> And when a DFS data node pipeline consists of such a node, the write
> performance degrades significantly.
> This may lead to some long tails for map/reduce jobs. We have experienced
> such behaviors quite often.
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