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Posted to hdfs-issues@hadoop.apache.org by "Eric Payne (JIRA)" <ji...@apache.org> on 2016/01/13 00:15:40 UTC

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

    [ https://issues.apache.org/jira/browse/HDFS-6221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15095183#comment-15095183 ] 

Eric Payne commented on HDFS-6221:
----------------------------------

[~daryn], is this still a problem post HDFS-7163?

> 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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