9d2f8043_Troubleshooting_Impala__Recommendation
[Symptom] Impala takes a long time to start. [Explanation] Impala instances with large numbers of tables, partitions, or data files take longer to start because the metadata for these objects is broadcast to all impalad nodes and cached. [Recommendation] 
Adjust timeout and synchronicity settings.
Troubleshooting Impala