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'impala.disableHmsSync' FEATURE: Implement global 'disable_hms_sync_by_default' flag for event processing. This change introduces a new catalogd startup flag, `disable_hms_sync_by_default`, to simplify skipping/processing events. Problem: Disabling event processing globally requires tedious process of setting 'impala.disableHmsSync' property on every database and table, especially if few specific tables requires sync up of events. Solution: The new flag provides a global default for the 'impala.disableHmsSync' property. Behavior: - If `disable_hms_sync_by_default` is true (the intended default-off state), event processing is skipped for all tables/databases unless the property "impala.disableHmsSync"="false" is explicitly set. - This allows users to easily keep event processing off by default and opt-in specific databases or tables to start syncing. - The check order is: table-property > db-property > global default. - HMS polling remains independent and unaffected by this flag. Change-Id: I4ee617aed48575502d9cf5cf2cbea6ec897d6839 Reviewed-on: http://gerrit.cloudera.org:8080/23487 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>