THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
When starting an Impala minicluster on a local machine using '$IMPALA_HOME/bin/start-impala-cluster.py', by default there is no authorization service, e.g., Sentry or Ranger, enabled on this cluster. We could enable the Ranger service initialized with the default policies on an Impala minicluster by the following steps (assuming that we have already executed '$IMPALA_HOME/testdata/bin/run-all.sh').
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