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Date: Sat, 19 Jul 2014 18:55:39 +0000 (UTC)
From: "Allen Wittenauer (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12398470.1213752031751.2779.1405796139063@arcas>
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Subject: [jira] [Resolved] (HDFS-97) DFS should detect slow links(nodes) and
 avoid them
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     [ https://issues.apache.org/jira/browse/HDFS-97?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Allen Wittenauer resolved HDFS-97.
----------------------------------

    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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