Chris Nauroth created HDFS-7367:
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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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