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To help supportability and debugging, it's helpful to have the impala shell print out the coordinator time and the link to the coordinator web UI once the query is submitted. This is done by calling the PingImpalaService() routine everytime a query is submitted, which returns the coordinator's hostname, webserver port and the coordinator epoch time at that moment which the shell then formats and prints out. Added tests to verify these new messages. Change-Id: I704eb64546e27c367830120241311fea6091266b Reviewed-on: http://gerrit.cloudera.org:8080/3507 Reviewed-by: Sailesh Mukil <sailesh@cloudera.com> Tested-by: Internal Jenkins