mannoopj opened a new pull request, #2089:
URL: https://github.com/apache/zookeeper/pull/2089

   [ZOOKEEPER-4753](https://issues.apache.org/jira/browse/ZOOKEEPER-4753): 
[zookeeper-server](https://issues.apache.org/jira/browse/ZOOKEEPER-server): 
Improvement: Explicit handling of D…
   …IGEST-MD5 vs GSSAPI in quorum auth
   
   Before this, the SASL-based quorum authorizer did not explicitly
   distinguish between the DIGEST-MD5 and GSSAPI mechanisms: it was
   simply relying on NameCallback and PasswordCallback for authentication
   with the former and examining Kerberos principals in AuthorizeCallback
   for the latter.
   
   It turns out that some SASL/DIGEST-MD5 configurations cause
   authentication and authorization IDs not to match the expected format,
   and the DIGEST-MD5-based portions of the quorum test suite to fail
   with obscure errors.  (They can be traced to failures to join the
   quorum, but only by looking into detailed logs.)
   
   This patch uses the login module name to determine whether DIGEST-MD5
   or GSSAPI is used, and relaxes the authentication ID check for the
   former.  As a cleanup, it keeps the password-based credential map
   empty when Kerberos principals are expected.  It finally adapts a
   test, and adds a new one, ensuring "weirdly-shaped" credentials only
   cause authentication failures in the GSSAPI case.


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