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From "Chen Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11303) Hedged read might hang infinitely if read data from all DN failed
Date Sun, 08 Jan 2017 13:45:58 GMT
Chen Zhang created HDFS-11303:
---------------------------------

             Summary: Hedged read might hang infinitely if read data from all DN failed 
                 Key: HDFS-11303
                 URL: https://issues.apache.org/jira/browse/HDFS-11303
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 3.0.0-alpha1
            Reporter: Chen Zhang


Hedged read will read from a DN first, if timeout, then read other DNs simultaneously.
If read all DN failed, this bug will cause the future-list not empty(the first timeout request
left in list), and hang in the loop infinitely



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