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Posted to hdfs-dev@hadoop.apache.org by "Chris Nauroth (JIRA)" <ji...@apache.org> on 2014/04/10 22:20:15 UTC

[jira] [Created] (HDFS-6231) DFSClient hangs infinitely if using hedged reads and all eligible datanodes die.

Chris Nauroth created HDFS-6231:
-----------------------------------

             Summary: DFSClient hangs infinitely if using hedged reads and all eligible datanodes die.
                 Key: HDFS-6231
                 URL: https://issues.apache.org/jira/browse/HDFS-6231
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 2.4.0, 3.0.0
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth


When using hedged reads, and all eligible datanodes for the read get flagged as dead or ignored, then the client is supposed to refetch block locations from the NameNode to retry the read.  Instead, we've seen that the client can hang indefinitely.



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