risdenk commented on issue #1068: SOLR-14033: Fix Hadoop tests with security manager URL: https://github.com/apache/lucene-solr/pull/1068#issuecomment-563662772 So this is because the `UserGroupInfromation` is initialized once statically in the JVM. If it isn't configured before being initialized then you end up w/ the wrong group implementation. I tried to set the group impl here https://github.com/apache/lucene-solr/pull/1068/files#diff-3c36d2ce2df3ab00d607b1c9eb01ae29R210 and then force the UGI initialization here https://github.com/apache/lucene-solr/pull/1068/files#diff-3c36d2ce2df3ab00d607b1c9eb01ae29R132 However if the order of Hadoop tests run where HdfsTestUtil#setupClass isn't run before any other Hadoop related test, the UGI gets initialized incorrectly and then fails with the stacktrace you shared. So yea I tried to bypass the whole group lookup crap by putting in a fake group lookup provider, but it requires the UGI to be initialized upfront. I haven't figured out the best place to ensure the UGI is initialized with the right config.
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