Hi @Andread B, Why do you want to run NiFi on the NameNode ? If you are ingesting lot of data I would recommend running NiFi on a dedicated host or at least on edge node. Also, if you will ingest lot of data for a single NiFi instance, you can use GenerateTableFetch (coming in NiFi 1.0) to divide your import into several chunks, and distribute them on several NiFi nodes. This processor will generate several FlowFiles based on the Partition Size property where each FlowFile is a query to get a part of the data. You can try this by downloading NiFi 1.0 Beta : https://nifi.apache.org/download.html ... View more