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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6221) Webhdfs should recover from dead DNs
Date Wed, 09 Apr 2014 16:58:17 GMT
Daryn Sharp created HDFS-6221:
---------------------------------

             Summary: 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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