Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/273#discussion_r124113747
--- Diff: core/src/main/java/org/apache/accumulo/core/rpc/ThriftUtil.java
---
@@ -282,21 +283,39 @@ public static TTransport
createClientTransport(HostAndPort address, int timeout,
try {
// Log in via UGI, ensures we have logged in with our KRB
credentials
final UserGroupInformation currentUser =
UserGroupInformation.getCurrentUser();
+ final UserGroupInformation userForRpc;
+ if (AuthenticationMethod.PROXY ==
currentUser.getAuthenticationMethod()) {
+ // A "proxy" user is when the real (Kerberos) credentials are
for a user
+ // other than the one we're acting as. When we make an RPC
though, we need to make sure
+ // that the current user is the user that has some credentials.
+ if (currentUser.getRealUser() != null) {
+ userForRpc = currentUser.getRealUser();
+ log.trace("{} is a proxy user, using real user instead {}",
currentUser, userForRpc);
+ } else {
+ // The current user has no credentials, let it fail
naturally at the RPC layer (no ticket)
+ // We know this won't work, but we can't do anything else
+ log.warn("The current user is a proxy user but there is no
underlying real user (RPCs will fail): {}", currentUser);
--- End diff --
Mostly, because it is a "best guess". This code is essentially reverting
strict assertions because I thought I knew how things were going to work in
practice.
I should update the comment to be a little less strongly worded.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
