  In August 2019, we introduced to our members and customers the idea of moving
LinkedIn's two core talent products -- Jobs and Recruiter -- onto a single
platform to help talent professionals be even more productive. This single
platform is called the New Recruiter & Jobs. A critical and difficult part of
this effort is migrating their existing data from the legacy database to the
new database and ensure there is no data discrepancy and no down time. In this
article, we will discuss the general architecture for a successful data
migration and the thought process we followed. Then we expand these ideas to
our circumstances and explain in more detail about our specific challenges and
solutions. In the Ramp Process section, we explain the inherent difficulties in
satisfying our success criteria and describe how we overcome these difficulties
and fulfill the success criteria practically.
