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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7367) HDFS short-circuit read cannot negotiate shared memory slot and file descriptors when SASL is enabled on DataTransferProtocol.
Date Thu, 06 Nov 2014 00:47:34 GMT
Chris Nauroth created HDFS-7367:
-----------------------------------

             Summary: HDFS short-circuit read cannot negotiate shared memory slot and file
descriptors when SASL is enabled on DataTransferProtocol.
                 Key: HDFS-7367
                 URL: https://issues.apache.org/jira/browse/HDFS-7367
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth


When both short-circuit read and SASL on DataTransferProtocol are enabled, the server side
tries to negotiate SASL on the operation to allocate a new shared memory slot.  However, the
transport for this operation is the Unix domain socket (not TCP), and the client always assumes
that Unix domain socket traffic is trustworthy.  The end result is that the server side still
attempts SASL negotiation, and it fails with an exception while erroneously trying to parse
the domain socket address as if it were a network address.  The read succeeds, but only because
we fallback to a read through the DataNode TCP server.  It's not a short-circuit read.



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