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                                            Shaddoll

Fix some persistence APIs to support sharded/partitioned SQL database and NoSQL database

We found an issue with mysql schema. Current mysql implementation doesn't support sharding, we have to fix it so that we won't have cross shard transaction in sharded mysql.

what kinds of database do uber cadence 's production environment used ?

We're currently using Cassandra at Uber and we're migrating to sharded mysql.

Excessive task_lists Updates Causing DB Connection Exhaustion

This query runs periodically for each task list to persist the ack level of each task list. You can change this [dynamic config](https://github.com/cadence-workflow/cadence/blob/master/common/dynamicconfig/dynamicproperties/constants.go#L5101) to decrease the frequency.