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This function is called after every DDL query, and was implemented by fetching the entire list of table names, even though only the length of that list was needed. In workloads with millions of tables, this could add several seconds of overhead following even simple requests like 'USE' or 'DESCRIBE'. I tested a backported version of this patch against one such workload. It reduced the time taken for a simple DESCRIBE query from 12-14sec down to about 40ms. I also tested locally that the metrics on impalad were still updated by DDL operations. Change-Id: Ic5467adbce1e760ff93996925db5611748efafc0 Reviewed-on: http://gerrit.cloudera.org:8080/10846 Reviewed-by: Vuk Ercegovac <vercegovac@cloudera.com> Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>