For the user impersonation support with Kerberos, we need to be able to represent the following:
For userA, what other users may userA "act" as and from what host(s) may userA do this from.
This was represented as the following in accumulo-site.xml:
Because we're dealing with Kerberos, "userA" is actually something like "primary/instance@REALM".
I've recently found out that Ambari doesn't like this and apparently it would be prohibitively difficult to change it there (urlencode, what?). I'll add some new configuration properties here that change the structure so that there are options for users to configure this through all deployment mechanisms.