Assume that you create a Microsoft SQL Server 2016 Integration Services (SSIS 2016) project, and you set the value of the AutoAdjustBufferSize property of a data flow to true. In this situation, you're unable to know the adjusted buffer size when the package is executing. After you install this update, you can get the adjusted buffer size from the BufferSizeTuning event of the SSIS logging feature.
Cumulative Update information
The improvement was first introduced in the following cumulative update of SQL Server.
Recommendation: Install the latest cumulative update for SQL Server
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. We recommend that you download and install the latest cumulative updates for SQL Server: