[jira] [Created] (IMPALA-7585) Always set user credentials after creating a KRPC proxy

["Michael Ho (JIRA)" <ji...@apache.org>]

Michael Ho created IMPALA-7585:
----------------------------------

             Summary: Always set user credentials after creating a KRPC proxy
                 Key: IMPALA-7585
                 URL: https://issues.apache.org/jira/browse/IMPALA-7585
             Project: IMPALA
          Issue Type: Bug
          Components: Distributed Exec
    Affects Versions: Impala 2.12.0, Impala 3.0
            Reporter: Michael Ho
            Assignee: Michael Ho


{{kudu::rpc::Proxy}} ctor may fail in {{GetLoggedInUser()}} for various reason:
{noformat}
Error calling getpwuid_r(): No such file or directory (error 2). 
{noformat}

This resulted in an empty user name being used in {{kudu::rpc::ConnectionId}}. With plaintext SASL (e.g. in an insecure Impala cluster), this may result in the following error:
{noformat}
Not authorized: Client connection negotiation failed: client connection to 127.0.0.1:27000: SASL(-1): generic failure: All-whitespace username.
{noformat}

While one can argue that Kudu should fall back to some default username (e.g. "cpp-client") when {{GetLoggedInUserName()}} fails, it may have non-trivial consequence (e.g. generating an authn token with some random username on one machine while using the real user name on another machine). Therefore, it's best for Impala to explicitly set the user credentials (impala/<some-hostname>) after creating the proxy.



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