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Monotonicity
The monotonicity means when we add a bucket, we need to remap all the keys. For s specify key is can only located in the origin bucket or the new bucket. It cannot reassign to another buc
现在MySQL的默认存储引擎是InnoDB,其提供了一个很强大的功能就是行级锁。可以通过show status like 'innodb_row_lock%';来查看当前系统的行锁争用情况。如果Innodb_row_lock_waits和Innodb_row_lock_time_avg两个值比较高,则说明锁争用比较严重。