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Posted to hdfs-issues@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2016/01/13 20:17:39 UTC

[jira] [Resolved] (HDFS-6221) Webhdfs should recover from dead DNs

     [ https://issues.apache.org/jira/browse/HDFS-6221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kihwal Lee resolved HDFS-6221.
------------------------------
    Resolution: Not A Problem

> Webhdfs should recover from dead DNs
> ------------------------------------
>
>                 Key: HDFS-6221
>                 URL: https://issues.apache.org/jira/browse/HDFS-6221
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode, webhdfs
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>
> We've repeatedly observed the jetty acceptor thread silently dying in the DNs.  The webhdfs servlet may also "disappear" and jetty returns non-json 404s.
> One approach to make webhdfs more resilient to bad DNs is dfsclient-like fetching of block locations to directly access the DNs instead of relying on a NN redirect that may repeatedly send the client to the same faulty DN(s).



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