Hi, Is Impala session hang means not able to run any queries? Is this issue observed via hue or impala-shell? repro the issue via impala-shell and check the coordinator logs to get any suspected error messages.  At the time of issue check the cluster load how may queries running concurrently, Issue may arise if any expensive/complex operations are running. Do not frequently run "invalidate metadata" query in the cluster it is one of the expensive operations and it pressurises the catalog service.   Regards, Chethan YM     ... View more