KB4516999 - FIX: File content is sent twice when copied to HDFS using Hadoop File System Task in SQL Server 2017 and 2019

Applies to: SQL Server 2017 on Windows (all editions)SQL Server 2019 on Windows


When you copy a file to Hadoop Distributed File System (HDFS) by using Hadoop File System Task, the performance is not optimal. Specifically, the file content is sent two times, but only one time is necessary. In the worst case, the issue may result in almost two times the execution duration.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. 


This issue is fixed in the following cumulative updates for SQL Server:
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Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:


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