When 43,508 flow files are sent to SplitJson, they are stacked in the queue and processed within the value set in nifi.queue.swap.threshold(= 20000). After that, a swap file was created and there are 23,508 stacks in the queue but it is not running any more and is stopped. nifi-app.log seems to be in progress because of an error in swap in. 2019-04-05 16:31:59,534 WARN [Timer-Driven Process Thread-6] o.a.n.controller.FileSystemSwapManager Cannot swap in FlowFiles from location D:\download\NIFI-1~1.0-B\NIFI-1~1.0\.\flowfile_repository\swap\1554449490032-01691059-3464-1fc9-0a1a-9def8b12c89e-15293fe8-c2ea-4f9d-a4fb-fd992716903d.swap because the FlowFile Repository does not know about this Swap Location. This file should be manually removed. This typically occurs when a Swap File is written but the FlowFile Repository is not updated yet to reflect this. This is generally not a cause for concern, but may be indicative of a failure to update the FlowFile Repository. Changing nifi.queue.swap.threshold = 40,000 will process up to 40,000 and stop equally. Thank you for your help. ... View more